Publications | Max Planck Institute for Intelligent Systems

55 results (View BibTeX file of all listed publications)

2009

Full phase and amplitude control in computer-generated holography

Fratz, M., Fischer, P., Giel, D. M.

OPTICS LETTERS, 34(23):3659-3661, 2009 (article)

Abstract

We report what we believe to be the first realization of a computer-generated complex-valued hologram recorded in a single film of photoactive polymer. Complex-valued holograms give rise to a diffracted optical field with control over its amplitude and phase. The holograms are generated by a one-step direct laser writing process in which a spatial light modulator (SLM) is imaged onto a polymer film. Temporal modulation of the SLM during exposure controls both the strength of the induced birefringence and the orientation of the fast axis. We demonstrate that complex holograms can be used to impart arbitrary amplitude and phase profiles onto a beam and thereby open new possibilities in the control of optical beams. (C) 2009 Optical Society of America

[BibTex]

2009

pf Fratz, M., Fischer, P., Giel, D. M. Full phase and amplitude control in computer-generated holography OPTICS LETTERS, 34(23):3659-3661, 2009 (article)

[BibTex]

Digital polarization holograms with defined magnitude and orientation of each pixel’s birefringence

Fratz, M., Giel, D. M., Fischer, P.

OPTICS LETTERS, 34(8):1270-1272, 2009 (article)

Abstract

A new form of digital polarization holography is demonstrated that permits both the amplitude and the phase of a diffracted beam to be independently controlled. This permits two independent intensity images to be stored in the same hologram. To fabricate the holograms, a birefringence with defined retardance and orientation of the fast axis is recorded into a photopolymer film. The holograms are selectively read out by choosing the polarization state of the read beam. Polarization holograms of this kind increase the data density in holographic data storage and allow higher quality diffractive optical elements to be written. (C) 2009 Optical Society of America

[BibTex]

pf Fratz, M., Giel, D. M., Fischer, P. Digital polarization holograms with defined magnitude and orientation of each pixel’s birefringence OPTICS LETTERS, 34(8):1270-1272, 2009 (article)

[BibTex]

Controlled Propulsion of Artificial Magnetic Nanostructured Propellers

Ghosh, A., Fischer, P.

NANO LETTERS, 9(6):2243-2245, 2009, Featured highlight ‘Nanotechnology: The helix that delivers’ Nature 459, 13 (2009). (article)

Abstract

For biomedical applications, such as targeted drug delivery and microsurgery, it is essential to develop a system of swimmers that can be propelled wirelessly in fluidic environments with good control. Here, we report the construction and operation of chiral colloidal propellers that can be navigated in water with micrometer-level precision using homogeneous magnetic fields. The propellers are made via nanostructured surfaces and can be produced in large numbers. The nanopropellers can carry chemicals, push loads, and act as local probes in rheological measurements.

Featured highlight ‘Nanotechnology: The helix that delivers’ Nature 459, 13 (2009).

Video - Nanospropellers DOI [BibTex]

pf Ghosh, A., Fischer, P. Controlled Propulsion of Artificial Magnetic Nanostructured Propellers NANO LETTERS, 9(6):2243-2245, 2009, Featured highlight ‘Nanotechnology: The helix that delivers’ Nature 459, 13 (2009). (article)

Video - Nanospropellers DOI [BibTex]

Absolute Asymmetric Reduction Based on the Relative Orientation of Achiral Reactants

Kuhn, A., Fischer, P.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 48(37):6857-6860, 2009 (article)

DOI [BibTex]

pf Kuhn, A., Fischer, P. Absolute Asymmetric Reduction Based on the Relative Orientation of Achiral Reactants ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 48(37):6857-6860, 2009 (article)

DOI [BibTex]

Magnetic mobile micro-robots

Pawashe, C., Floyd, S., Sitti, M.

7eme Journees Nationales de la Recherche en Robotique, 2009 (article)

[BibTex]

pi Pawashe, C., Floyd, S., Sitti, M. Magnetic mobile micro-robots 7eme Journees Nationales de la Recherche en Robotique, 2009 (article)

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Gecko-Inspired Directional and Controllable Adhesion

Murphy, M. P., Aksak, B., Sitti, M.

Small, 5(2):170-175, WILEY-VCH Verlag, 2009 (article)

Project Page [BibTex]

pi Murphy, M. P., Aksak, B., Sitti, M. Gecko-Inspired Directional and Controllable Adhesion Small, 5(2):170-175, WILEY-VCH Verlag, 2009 (article)

Project Page [BibTex]

Multiple magnetic microrobot control using electrostatic anchoring

Pawashe, C., Floyd, S., Sitti, M.

Applied Physics Letters, 94(16):164108, AIP, 2009 (article)

[BibTex]

pi Pawashe, C., Floyd, S., Sitti, M. Multiple magnetic microrobot control using electrostatic anchoring Applied Physics Letters, 94(16):164108, AIP, 2009 (article)

[BibTex]

Wet self-cleaning of biologically inspired elastomer mushroom shaped microfibrillar adhesives

Kim, S., Cheung, E., Sitti, M.

Langmuir, 25(13):7196-7199, ACS Publications, 2009 (article)

[BibTex]

pi Kim, S., Cheung, E., Sitti, M. Wet self-cleaning of biologically inspired elastomer mushroom shaped microfibrillar adhesives Langmuir, 25(13):7196-7199, ACS Publications, 2009 (article)

[BibTex]

Teleoperated Three-Dimensional Force Feedback from the Nanoscale with an Atomic Force Microscope

Onal, C. D., Sitti, M.

2009 (article)

[BibTex]

pi Onal, C. D., Sitti, M. Teleoperated Three-Dimensional Force Feedback from the Nanoscale with an Atomic Force Microscope 2009 (article)

[BibTex]

Robot ceiling climbers harness new tricks

Marks, Paul

New Scientist, 202(2705):18-19, Reed Business Information, 2009 (article)

[BibTex]

pi Marks, Paul Robot ceiling climbers harness new tricks New Scientist, 202(2705):18-19, Reed Business Information, 2009 (article)

[BibTex]

Biologically-Inspired Patterned and Coated Adhesives for Medical Devices

Glass, P, Chung, H, Lee, C, Tworkoski, E, Washburn, NR, Sitti, M

Journal of Medical Devices, 3(2):027537, American Society of Mechanical Engineers, 2009 (article)

[BibTex]

pi Glass, P, Chung, H, Lee, C, Tworkoski, E, Washburn, NR, Sitti, M Biologically-Inspired Patterned and Coated Adhesives for Medical Devices Journal of Medical Devices, 3(2):027537, American Society of Mechanical Engineers, 2009 (article)

[BibTex]

Modeling and experimental characterization of an untethered magnetic micro-robot

Pawashe, C., Floyd, S., Sitti, M.

The International Journal of Robotics Research, 28(8):1077-1094, Sage Publications, 2009 (article)

[BibTex]

pi Pawashe, C., Floyd, S., Sitti, M. Modeling and experimental characterization of an untethered magnetic micro-robot The International Journal of Robotics Research, 28(8):1077-1094, Sage Publications, 2009 (article)

[BibTex]

Towards automated nanoassembly with the atomic force microscope: A versatile drift compensation procedure

Krohs, F., Onal, C., Sitti, M., Fatikow, S.

Journal of Dynamic Systems, Measurement, and Control, 131(6):061106, American Society of Mechanical Engineers, 2009 (article)

[BibTex]

pi Krohs, F., Onal, C., Sitti, M., Fatikow, S. Towards automated nanoassembly with the atomic force microscope: A versatile drift compensation procedure Journal of Dynamic Systems, Measurement, and Control, 131(6):061106, American Society of Mechanical Engineers, 2009 (article)

[BibTex]

Enhanced adhesion by gecko-inspired hierarchical fibrillar adhesives

Murphy, M. P., Kim, S., Sitti, M.

ACS applied materials \& interfaces, 1(4):849-855, American Chemical Society, 2009 (article)

Project Page [BibTex]

pi Murphy, M. P., Kim, S., Sitti, M. Enhanced adhesion by gecko-inspired hierarchical fibrillar adhesives ACS applied materials \& interfaces, 1(4):849-855, American Chemical Society, 2009 (article)

Project Page [BibTex]

Miniature devices: Voyage of the microrobots

Sitti, M.

Nature, 458(7242):1121-1122, Nature Publishing Group, 2009 (article)

[BibTex]

pi Sitti, M. Miniature devices: Voyage of the microrobots Nature, 458(7242):1121-1122, Nature Publishing Group, 2009 (article)

[BibTex]

Dry spinning based spinneret based tunable engineered parameters (STEP) technique for controlled and aligned deposition of polymeric nanofibers

Nain, A. S., Sitti, M., Jacobson, A., Kowalewski, T., Amon, C.

Macromolecular rapid communications, 30(16):1406-1412, WILEY-VCH Verlag, 2009 (article)

[BibTex]

pi Nain, A. S., Sitti, M., Jacobson, A., Kowalewski, T., Amon, C. Dry spinning based spinneret based tunable engineered parameters (STEP) technique for controlled and aligned deposition of polymeric nanofibers Macromolecular rapid communications, 30(16):1406-1412, WILEY-VCH Verlag, 2009 (article)

[BibTex]

Two-dimensional contact and noncontact micromanipulation in liquid using an untethered mobile magnetic microrobot

Floyd, S., Pawashe, C., Sitti, M.

IEEE Transactions on Robotics, 25(6):1332-1342, IEEE, 2009 (article)

[BibTex]

pi Floyd, S., Pawashe, C., Sitti, M. Two-dimensional contact and noncontact micromanipulation in liquid using an untethered mobile magnetic microrobot IEEE Transactions on Robotics, 25(6):1332-1342, IEEE, 2009 (article)

[BibTex]

A scaled bilateral control system for experimental one-dimensional teleoperated nanomanipulation

Onal, C. D., Sitti, M.

The International Journal of Robotics Research, 28(4):484-497, Sage Publications, 2009 (article)

[BibTex]

pi Onal, C. D., Sitti, M. A scaled bilateral control system for experimental one-dimensional teleoperated nanomanipulation The International Journal of Robotics Research, 28(4):484-497, Sage Publications, 2009 (article)

[BibTex]

A Swallowable Tethered Capsule Endoscope for Diagnosing Barrett’s Esophagus

Glass, P., Sitti, M., Pennathur, A., Appasamy, R.

Gastrointestinal Endoscopy, 69(5):AB106, Mosby, 2009 (article)

Project Page [BibTex]

pi Glass, P., Sitti, M., Pennathur, A., Appasamy, R. A Swallowable Tethered Capsule Endoscope for Diagnosing Barrett’s Esophagus Gastrointestinal Endoscopy, 69(5):AB106, Mosby, 2009 (article)

Project Page [BibTex]

Adhesion of biologically inspired polymer microfibers on soft surfaces

Cheung, E., Sitti, M.

Langmuir, 25(12):6613-6616, ACS Publications, 2009 (article)

[BibTex]

pi Cheung, E., Sitti, M. Adhesion of biologically inspired polymer microfibers on soft surfaces Langmuir, 25(12):6613-6616, ACS Publications, 2009 (article)

[BibTex]

Dangling chain elastomers as repeatable fibrillar adhesives

Sitti, M., Cusick, B., Aksak, B., Nese, A., Lee, H., Dong, H., Kowalewski, T., Matyjaszewski, K.

ACS applied materials \& interfaces, 1(10):2277-2287, American Chemical Society, 2009 (article)

[BibTex]

pi Sitti, M., Cusick, B., Aksak, B., Nese, A., Lee, H., Dong, H., Kowalewski, T., Matyjaszewski, K. Dangling chain elastomers as repeatable fibrillar adhesives ACS applied materials \& interfaces, 1(10):2277-2287, American Chemical Society, 2009 (article)

[BibTex]

Reversible dry micro-fibrillar adhesives with thermally controllable adhesion

Kim, S., Sitti, M., Xie, T., Xiao, X.

Soft Matter, 5(19):3689-3693, Royal Society of Chemistry, 2009 (article)

Project Page [BibTex]

pi Kim, S., Sitti, M., Xie, T., Xiao, X. Reversible dry micro-fibrillar adhesives with thermally controllable adhesion Soft Matter, 5(19):3689-3693, Royal Society of Chemistry, 2009 (article)

Project Page [BibTex]

Enhanced reversible adhesion of dopamine methacrylamide-coated elastomer microfibrillar structures under wet conditions

Glass, P., Chung, H., Washburn, N. R., Sitti, M.

Langmuir, 25(12):6607-6612, ACS Publications, 2009 (article)

Project Page [BibTex]

pi Glass, P., Chung, H., Washburn, N. R., Sitti, M. Enhanced reversible adhesion of dopamine methacrylamide-coated elastomer microfibrillar structures under wet conditions Langmuir, 25(12):6607-6612, ACS Publications, 2009 (article)

Project Page [BibTex]

2007

Frequency-domain displacement sensing with a fiber ring-resonator containing a variable gap

Vollmer, F., Fischer, P.

SENSORS AND ACTUATORS A-PHYSICAL, 134(2):410-413, 2007 (article)

Abstract

Ring-resonators are in general not amenable to strain-free (non-contact) displacement measurements. We show that this limitation may be overcome if the ring-resonator, here a fiber-loop, is designed to contain a gap, such that the light traverses a free-space part between two aligned waveguide ends. Displacements are determined with nanometer sensitivity by measuring the associated changes in the resonance frequencies. Miniaturization should increase the sensitivity of the ring-resonator interferometer. Ring geometries that contain an optical circulator can be used to profile reflective samples. (c) 2006 Elsevier B.V. All rights reserved.

DOI [BibTex]

2007

pf Vollmer, F., Fischer, P. Frequency-domain displacement sensing with a fiber ring-resonator containing a variable gap SENSORS AND ACTUATORS A-PHYSICAL, 134(2):410-413, 2007 (article)

DOI [BibTex]

Observation of the Faraday effect via beam deflection in a longitudinal magnetic field

Ghosh, A., Hill, W., Fischer, P.

PHYSICAL REVIEW A, 76(5), 2007 (article)

Abstract

We show that magnetic-field-induced circular differential deflection of light can be observed in reflection or refraction at a single interface. The difference in the reflection or refraction angles between the two circular polarization components is a function of the magnetic-field strength and the Verdet constant, and permits the observation of the Faraday effect not via polarization rotation in transmission, but via changes in the propagation direction. Deflection measurements do not suffer from n-pi ambiguities and are shown to be another means to map magnetic fields with high axial resolution, or to determine the sign and magnitude of magnetic-field pulses in a single measurement.

DOI [BibTex]

pf Ghosh, A., Hill, W., Fischer, P. Observation of the Faraday effect via beam deflection in a longitudinal magnetic field PHYSICAL REVIEW A, 76(5), 2007 (article)

DOI [BibTex]

Comment on “negative refraction at optical frequencies in nonmagnetic two-component molecular media” - Reply

Chen, Y., Fischer, P., Wise, F. W.

PHYSICAL REVIEW LETTERS, 98(5), 2007 (article)

DOI [BibTex]

pf Chen, Y., Fischer, P., Wise, F. W. Comment on “negative refraction at optical frequencies in nonmagnetic two-component molecular media” - Reply PHYSICAL REVIEW LETTERS, 98(5), 2007 (article)

DOI [BibTex]

Circular differential double diffraction in chiral media

Ghosh, A., Fazal, F. M., Fischer, P.

OPTICS LETTERS, 32(13):1836-1838, 2007 (article)

Abstract

In an optically active liquid the diffraction angle depends on the circular polarization state of the incident light beam. We report the observation of circular differential diffraction in an isotropic chiral medium, and we demonstrate that double diffraction is an alternate means to determine the handedness (enantiomeric excess) of a solution. (c) 2007 Optical Society of America.

DOI [BibTex]

pf Ghosh, A., Fazal, F. M., Fischer, P. Circular differential double diffraction in chiral media OPTICS LETTERS, 32(13):1836-1838, 2007 (article)

DOI [BibTex]

Bacterial flagella-based propulsion and on/off motion control of microscale objects

Behkam, B., Sitti, M.

Applied Physics Letters, 90(2):023902, AIP, 2007 (article)

[BibTex]

pi Behkam, B., Sitti, M. Bacterial flagella-based propulsion and on/off motion control of microscale objects Applied Physics Letters, 90(2):023902, AIP, 2007 (article)

[BibTex]

Friction of partially embedded vertically aligned carbon nanofibers inside elastomers

Aksak, B., Sitti, M., Cassell, A., Li, J., Meyyappan, M., Callen, P.

Applied Physics Letters, 91(6):061906, AIP, 2007 (article)

[BibTex]

pi Aksak, B., Sitti, M., Cassell, A., Li, J., Meyyappan, M., Callen, P. Friction of partially embedded vertically aligned carbon nanofibers inside elastomers Applied Physics Letters, 91(6):061906, AIP, 2007 (article)

[BibTex]

Enhanced friction of elastomer microfiber adhesives with spatulate tips

Kim, S., Aksak, B., Sitti, M.

Applied Physics Letters, 91(22):221913, AIP, 2007 (article)

Project Page [BibTex]

pi Kim, S., Aksak, B., Sitti, M. Enhanced friction of elastomer microfiber adhesives with spatulate tips Applied Physics Letters, 91(22):221913, AIP, 2007 (article)

Project Page [BibTex]

Microscale and nanoscale robotics systems [grand challenges of robotics]

Sitti, M.

IEEE Robotics \& Automation Magazine, 14(1):53-60, IEEE, 2007 (article)

[BibTex]

pi Sitti, M. Microscale and nanoscale robotics systems [grand challenges of robotics] IEEE Robotics \& Automation Magazine, 14(1):53-60, IEEE, 2007 (article)

[BibTex]

A new biomimetic adhesive for therapeutic capsule endoscope applications in the gastrointestinal tract

Glass, P., Sitti, M., Appasamy, R.

Gastrointestinal Endoscopy, 65(5):AB91, Mosby, 2007 (article)

[BibTex]

pi Glass, P., Sitti, M., Appasamy, R. A new biomimetic adhesive for therapeutic capsule endoscope applications in the gastrointestinal tract Gastrointestinal Endoscopy, 65(5):AB91, Mosby, 2007 (article)

[BibTex]

Visual servoing-based autonomous 2-D manipulation of microparticles using a nanoprobe

Onal, C. D., Sitti, M.

IEEE Transactions on control systems technology, 15(5):842-852, IEEE, 2007 (article)

[BibTex]

pi Onal, C. D., Sitti, M. Visual servoing-based autonomous 2-D manipulation of microparticles using a nanoprobe IEEE Transactions on control systems technology, 15(5):842-852, IEEE, 2007 (article)

[BibTex]

Bacteria integrated swimming microrobots

Behkam, B., Sitti, M.

In 50 years of artificial intelligence, pages: 154-163, Springer Berlin Heidelberg, 2007 (incollection)

[BibTex]

pi Behkam, B., Sitti, M. Bacteria integrated swimming microrobots In 50 years of artificial intelligence, pages: 154-163, Springer Berlin Heidelberg, 2007 (incollection)

[BibTex]

Adhesion of biologically inspired vertical and angled polymer microfiber arrays

Aksak, B., Murphy, M. P., Sitti, M.

Langmuir, 23(6):3322-3332, ACS Publications, 2007 (article)

Project Page [BibTex]

pi Aksak, B., Murphy, M. P., Sitti, M. Adhesion of biologically inspired vertical and angled polymer microfiber arrays Langmuir, 23(6):3322-3332, ACS Publications, 2007 (article)

Project Page [BibTex]

Waalbot: An agile small-scale wall-climbing robot utilizing dry elastomer adhesives

Murphy, M. P., Sitti, M.

IEEE/ASME transactions on Mechatronics, 12(3):330-338, IEEE, 2007 (article)

[BibTex]

pi Murphy, M. P., Sitti, M. Waalbot: An agile small-scale wall-climbing robot utilizing dry elastomer adhesives IEEE/ASME transactions on Mechatronics, 12(3):330-338, IEEE, 2007 (article)

[BibTex]

Subfeature patterning of organic and inorganic materials using robotic assembly

Tafazzoli, A., Cheng, C., Pawashe, C., Sabo, E. K., Trofin, L., Sitti, M., LeDuc, P. R.

Journal of materials research, 22(06):1601-1608, Cambridge University Press, 2007 (article)

[BibTex]

pi Tafazzoli, A., Cheng, C., Pawashe, C., Sabo, E. K., Trofin, L., Sitti, M., LeDuc, P. R. Subfeature patterning of organic and inorganic materials using robotic assembly Journal of materials research, 22(06):1601-1608, Cambridge University Press, 2007 (article)

[BibTex]

Effect of backing layer thickness on adhesion of single-level elastomer fiber arrays

Kim, S., Sitti, M., Hui, C., Long, R., Jagota, A.

Applied Physics Letters, 91(16):161905, AIP, 2007 (article)

[BibTex]

pi Kim, S., Sitti, M., Hui, C., Long, R., Jagota, A. Effect of backing layer thickness on adhesion of single-level elastomer fiber arrays Applied Physics Letters, 91(16):161905, AIP, 2007 (article)

[BibTex]

Adhesion and anisotropic friction enhancements of angled heterogeneous micro-fiber arrays with spherical and spatula tips

Murphy, M. P., Aksak, B., Sitti, M.

Journal of Adhesion Science and Technology, 21(12-13):1281-1296, Taylor & Francis Group, 2007 (article)

Project Page [BibTex]

pi Murphy, M. P., Aksak, B., Sitti, M. Adhesion and anisotropic friction enhancements of angled heterogeneous micro-fiber arrays with spherical and spatula tips Journal of Adhesion Science and Technology, 21(12-13):1281-1296, Taylor & Francis Group, 2007 (article)

Project Page [BibTex]

Surface-tension-driven biologically inspired water strider robots: Theory and experiments

Song, Y. S., Sitti, M.

IEEE Transactions on robotics, 23(3):578-589, IEEE, 2007 (article)

[BibTex]

pi Song, Y. S., Sitti, M. Surface-tension-driven biologically inspired water strider robots: Theory and experiments IEEE Transactions on robotics, 23(3):578-589, IEEE, 2007 (article)

[BibTex]

2003

New electro-optic effect: Sum-frequency generation from optically active liquids in the presence of a dc electric field

Fischer, P., Buckingham, A., Beckwitt, K., Wiersma, D., Wise, F.

PHYSICAL REVIEW LETTERS, 91(17), 2003 (article)

Abstract

We report the observation of sum-frequency signals that depend linearly on an applied electrostatic field and that change sign with the handedness of an optically active solute. This recently predicted chiral electro-optic effect exists in the electric-dipole approximation. The static electric field gives rise to an electric-field-induced sum-frequency signal (an achiral third-order process) that interferes with the chirality-specific sum-frequency at second order. The cross-terms linear in the electrostatic field constitute the effect and may be used to determine the absolute sign of second- and third-order nonlinear-optical susceptibilities in isotropic media.

DOI [BibTex]

2003

pf Fischer, P., Buckingham, A., Beckwitt, K., Wiersma, D., Wise, F. New electro-optic effect: Sum-frequency generation from optically active liquids in the presence of a dc electric field PHYSICAL REVIEW LETTERS, 91(17), 2003 (article)

DOI [BibTex]

Chiral and achiral contributions to sum-frequency generation from optically active solutions of binaphthol

Fischer, P., Wise, F., Albrecht, A.

JOURNAL OF PHYSICAL CHEMISTRY A, 107(40):8232-8238, 2003 (article)

Abstract

The nonlinear sum- and difference-frequency generation spectroscopies can be probes of molecular chirality in optically active systems. We present a tensorial analysis of the chirality-specific electric-dipolar sum-frequency-generation susceptibility and the achiral electric-quadrupolar and magnetic-dipolar nonlinearities at second order in isotropic media. The chiral and achiral contributions to the sum-frequency signal from the bulk of optically active solutions of 1,1'-bi-2-naphthol (2,2'-dehydroxy-1,1'-binaphthyl) can be distinguished, and the former dominates. Ab initio computations reveal the dramatic resonance enhancement that the isotropic component of the electric-dipolar three-wave mixing hyperpolarizability experiences. Away from resonance its magnitude rapidly decreases, as-unlike the vector component-it is zero in the static limit. The dispersion of the first hyperpolarizability is computed by a configuration interaction singles sum-over-states approach with explicit regard to the Franck-Condon active vibrational substructure for all resonant electronic states.

DOI [BibTex]

pf Fischer, P., Wise, F., Albrecht, A. Chiral and achiral contributions to sum-frequency generation from optically active solutions of binaphthol JOURNAL OF PHYSICAL CHEMISTRY A, 107(40):8232-8238, 2003 (article)

DOI [BibTex]

Synthetic gecko foot-hair micro/nano-structures as dry adhesives

Sitti, M., Fearing, R. S.

Journal of adhesion science and technology, 17(8):1055-1073, Taylor & Francis Group, 2003 (article)

Project Page [BibTex]

pi Sitti, M., Fearing, R. S. Synthetic gecko foot-hair micro/nano-structures as dry adhesives Journal of adhesion science and technology, 17(8):1055-1073, Taylor & Francis Group, 2003 (article)

Project Page [BibTex]

Teleoperated touch feedback from the surfaces at the nanoscale: modeling and experiments

Sitti, M., Hashimoto, H.

IEEE/ASME transactions on mechatronics, 8(2):287-298, IEEE, 2003 (article)

[BibTex]

pi Sitti, M., Hashimoto, H. Teleoperated touch feedback from the surfaces at the nanoscale: modeling and experiments IEEE/ASME transactions on mechatronics, 8(2):287-298, IEEE, 2003 (article)

[BibTex]

Scaled teleoperation system for nano-scale interaction and manipulation

Sitti, M., Aruk, B., Shintani, H., Hashimoto, H.

Advanced Robotics, 17(3):275-291, Taylor & Francis Group, 2003 (article)

[BibTex]

pi Sitti, M., Aruk, B., Shintani, H., Hashimoto, H. Scaled teleoperation system for nano-scale interaction and manipulation Advanced Robotics, 17(3):275-291, Taylor & Francis Group, 2003 (article)

[BibTex]

Atomic force microscope probe based controlled pushing for nano-tribological characterization

Sitti, M.

IEEE/ASME Transactions on Mechatronics, 8(3), 2003 (article)

[BibTex]

pi Sitti, M. Atomic force microscope probe based controlled pushing for nano-tribological characterization IEEE/ASME Transactions on Mechatronics, 8(3), 2003 (article)

[BibTex]

Efficient charge recovery method for driving piezoelectric actuators with quasi-square waves

Campolo, D., Sitti, M., Fearing, R. S.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 50(3):237-244, IEEE, 2003 (article)

[BibTex]

pi Campolo, D., Sitti, M., Fearing, R. S. Efficient charge recovery method for driving piezoelectric actuators with quasi-square waves IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 50(3):237-244, IEEE, 2003 (article)

[BibTex]

Piezoelectrically actuated four-bar mechanism with two flexible links for micromechanical flying insect thorax

Sitti, M.

IEEE/ASME transactions on mechatronics, 8(1):26-36, IEEE, 2003 (article)

[BibTex]

pi Sitti, M. Piezoelectrically actuated four-bar mechanism with two flexible links for micromechanical flying insect thorax IEEE/ASME transactions on mechatronics, 8(1):26-36, IEEE, 2003 (article)

[BibTex]

2001

Isotropic second-order nonlinear optical susceptibilities

Fischer, P., Buckingham, A., Albrecht, A.

PHYSICAL REVIEW A, 64(5), 2001 (article)

Abstract

The second-order nonlinear optical susceptibility, in the electric dipole approximation, is only nonvanishing for materials that are noncentrosymmetric. Should the medium be isotropic, then only a chiral system. such as an optically active liquid, satisfies this symmetry requirement. We derive the quantum-mechanical form of the isotropic component of the sum- and difference-frequency susceptibility and discuss its unusual spectral properties. We show that any coherent second-order nonlinear optical process in a system of randomly oriented molecules requires the medium to be chiral. and the incident frequencies to be different and nonzero. Furthermore, a minimum of two nondegenerate excited molecular states are needed for the isotropic part of the susceptibility to be nonvanishing. The rotationally invariant susceptibility is zero in the static field limit and shows exceptionally sensitive resonance and dephasing effects that are particular to chiral centers.

DOI [BibTex]

2001

pf Fischer, P., Buckingham, A., Albrecht, A. Isotropic second-order nonlinear optical susceptibilities PHYSICAL REVIEW A, 64(5), 2001 (article)

DOI [BibTex]

Reply to “Comment on ‘Phenomenological damping in optical response tensors’”

Buckingham, A., Fischer, P.

PHYSICAL REVIEW A, 63(4), 2001 (article)

Abstract

We show that damping factors must not be incorporated in the perturbation of the ground state by a static electric field. If they are included, as in the theory of Stedman et al. {[}preceding Comment. Phys. Rev. A 63, 047801 (2001)], then there would be an electric dipole in the y direction induced in a hydrogen atom in the M-s = + 1/2 state by a static electric field in the x direction. Such a dipole is excluded by symmetry.

DOI [BibTex]

pf Buckingham, A., Fischer, P. Reply to “Comment on ‘Phenomenological damping in optical response tensors’” PHYSICAL REVIEW A, 63(4), 2001 (article)

DOI [BibTex]

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