Lee, Jin Woo, Tung, Ryan C, Raman, Arvind, Sumali, Hartono, Sullivan, John P
An improved theoretical approach is proposed to predict the dynamic behavior of long, slender and flexible microcantilevers affected by squeeze-film damping at low ambient pressures. Our approach...
Bidkar, Rahul, Kimber, Mark, Raman, Arvind, Bajaj, Anil, Garimella, Suresh
Slender sharp-edged flexible beams such as flapping wings of micro air vehicles (MAVs), piezoelectric fans and insect wings typically oscillate at moderate-to-high values of non-dimensional frequency...
Strus, Mark, Lahiji, Roya R, Ares, Pablo, Lopez, Vicente, Raman, Arvind, Reifenberger, R.
The interplay between local mechanical strain energy and lateral frictional forces determines the shape of carbon nanotubes on substrates. In turn, because of its nanometer-size diameter, the shape...
Origins of phase contrast in the atomic force microscope in liquids (2009)
Melcher, John, Carrasco, Carolina, Xu, Xianfan, Carrascosa, Jose L, Gomez-Herrero, Julio, Jose De Pablo, Pedro, ...
We study the physical origins of phase contrast in dynamic atomic force microscopy (dAFM) in liquids where low-stiffness microcantilever probes are often used for nanoscale imaging of soft biological...
Unified theory of gas damping of flexible microcantilevers at low ambient pressures (2009)
Bidkar, Rahul, Tung, Ryan C, Alexeenko, Alina A, Sumali, Hartono, Raman, Arvind
Predicting the gas damping of microcantilevers oscillating in different vibration modes in unbounded gas at low pressures is relevant for increasing the sensitivity of microcantilever-based sensors....
Strus, Mark C, Cano, Camilo I, Pipes, R. Byron, Nguyen, Cattien V., Raman, Arvind
The future development of polymer composite materials with nanotubes or nanoscale fibers requires the ability to understand and improve the interfacial bonding at the nanotube-polymer matrix...
Strus, Mark C., Cano, Camilo I., Pipes, R. Byron, Nguyen, Cattien V., Raman, Arvind
The future development of polymer composite materials with nanotubes or nanoscale fibers requires the ability to understand and improve the interfacial bonding at the nanotube-polymer matrix...
Theoretical basis of parametric-resonance-based atomic force microscopy (2009)
Prakash, G, Hu, S, Raman, Arvind, Reifenberger, R.
Parametric resonance underpins the physics of swings, resonant surface waves, and particle traps. There is increasing interest in its potential applications in atomic force microscopy (AFM). In this...
Xu, Xin, Melcher, John, Basak, Sudipta, Reifenberger, R., Raman, Arvind
Atomic Force microscope (AFM) cantilevers commonly used for imaging soft biological samples in liquids experience a momentary excitation of the higher eigenmodes at each tap. This transient response...
Flexural vibration spectra of carbon nanotubes measured using laser Doppler vibrometry (2009)
Biedermann, Laura, Tung, Ryan C, Raman, Arvind, Reifenberger, R.
Laser Doppler vibrometry is used to measure the thermal vibration spectra of individual multiwalled carbon nanotubes (MWNTs) under ambient conditions. Since the entire vibration spectrum is measured...
Nanoelectronics: Metrology and Computation (2008)
Mark Lundstrom, Jason V. Clark, Gerhard Klimeck, Arvind Raman
Abstract. Research in nanoelectronics poses new challenges for metrology, but advances in theory, simulation and computing and networking technology provide new opportunities to couple simulation and...
Hydrodynamic loading of microcantilevers oscillating near rigid walls (2008)
Tung, Ryan C, Anirban, Jana, Raman, Arvind
The vibrations of microcantilevers in atomic force microscopes (AFMs) or radio frequency (RF) switches are strongly influenced by the viscous hydrodynamics of the surrounding fluid in the vicinity of...
Nanoelectronics: Metrology and Computation (2008)
Lundstrom, Mark S., Clark, Jason Vaughn, Klimeck, Gerhard, Raman, Arvind
Research in nanoelectronics poses new challenges for metrology, but advances in theory, simulation and computing and networking technology provide new opportunities to couple simulation and...
Quantifying the tip-sample interaction forces in amplitude-modulated atomic force microscopy (AM-AFM) has been an elusive yet important goal in nanoscale imaging, manipulation and spectroscopy using...
Multiple impact regimes in liquid environment dynamic atomic force microscopy (2008)
Melcher, John, Xu, Xin, Raman, Arvind
A canonical assumption in dynamic atomic force microscopy is that the probe tip interacts with the sample once per oscillation cycle. We show this key ansatz breaks down for soft cantilevers in...
Xu, Xin, Carrasco, Carolina, Jose De Pablo, Pedro, Gomez-Herrero, Julio, Raman, Arvind
Dynamic atomic force microscopy is widely used for the imaging of soft biological materials in liquid environments; yet very little is known about the peak forces exerted by the oscillating probe...
Quantifying the tip-sample interaction forces in amplitude-modulated atomic force microscopy (AM-AFM) has been an elusive yet important goal in nanoscale imaging, manipulation and spectroscopy using...
Invited Article: VEDA: A web-based virtual environment for dynamic atomic force microscopy (2008)
Melcher, John, Hu, Shuiqing, Raman, Arvind
We describe here the theory and applications of virtual environment dynamic atomic force microscopy (VEDA), a suite of state-of-the-art simulation tools deployed on nanoHUB (www.nanohub.org) for the...
Spletzer, Matthew A, Raman, Arvind, Sumali, Hartono, Sullivan, John P
We study the use of vibration localization in large arrays of mechanically coupled, nearly identical microcantilevers for ultrasensitive mass detection and identification. We demonstrate that...
Stick-slip motions in the friction force microscope: Effects of tip compliance (2008)
Conley, William G, Krousgrill, Charles M, Raman, Arvind
When a microcantilever with a nanoscale tip is scanned laterally over a surface to measure the nanoscale frictional forces, the onset of stick-slip tip motions is an extremely important phenomenon...
Strus, Mark, Zalamea, Luis, Raman, Arvind, Pipes, Byron, Nguyen, Cattien, Stach, E A
The physics of adhesion and stiction of one-dimensional nanostructures such as nanotubes, nanowires, and biopolymers on different material substrates is of great interest for the study of biological...
Elastometric sensing using higher flexural eigenmodes of microcantilevers (2007)
Spletzer, Matthew A, Raman, Arvind, Reifenberger, R.
We present a method to detect with high sensitivity the viscoelastic property changes of sensor coatings on microcantilever arrays due to radiation, analyte binding, or adsorption. The method uses...
Determining the peak interaction force between an oscillating nanoscale tip and a sample surface has been a fundamental yet elusive goal in amplitude-modulated atomic force microscopy. Closed form...
Dynamics of tapping mode atomic force microscopy in liquids: Theory and experiments (2007)
A mathematical model is presented to predict the oscillating dynamics of atomic force microscope cantilevers with nanoscale tips tapping on elastic samples in liquid environments. Theoretical...
Magnetic, acoustic, and thermal (Brownian motion induced) excitations are commonly used for dynamic atomic force microscopy (AFM) in liquids, yet the fundamental differences in microcantilever...
Hydrodynamics of torsional probes for atomic force microscopy in liquids (2007)
Basak, Sudipta, Beyder, Arthur, Spagnoli, Chiara, Raman, Arvind, Sachs, Fredrick
Improving the force resolution of atomic force microscopy for soft samples in liquid requires soft cantilevers with reduced hydrodynamic cross section. Single and dual axis torsion levers Beyder and...
Nanoelectronics: Metrology and Computation (2007)
Lundstrom, Mark, Clark, Jason V., Klimeck, Gerhard, Raman, Arvind
Research in nanoelectronics poses new challenges for metrology, but advances in theory, simulation and computing and networking technology provide new opportunities to couple simulation and...
Microcantilever mechanics in flowing viscous fluids (2007)
Jana, Anirban, Raman, Arvind, Dhayal, Babita, Tripp, Steven L, Reifenberger, R.
Microcantilevers are often deployed in flowing fluids to measure local flow velocities or to detect rapidly the nanomechanical binding of trace quantities of target analytes. The authors investigate...
Chladni Figures Revised Based on Nanomechanics (2007)
Dorrestijn, M., Bietsch, A., Açikalin, T., Raman, Arvind, Hegner, M., Meyer, E., ...
Chladni patterns based on nanomechanics in the microfluidic environment are presented. In contrast with the macroscopic observations in the gaseous environment, nanoparticles are found to move to the...
Hydrodynamic coupling between micomechanical beams osciallating in viscous fluids (2007)
We analyze the hydrodynamic coupling between long, slender micromechanical beams microbeams
Piezoelectric Fans using Higher Flexural Modes for Electronics Cooling Applications (2007)
Wait, Sydney M, Basak, Sudipta, Garimella , S V, Raman, Arvind
Piezoelectric fans are gaining in popularity as low-power-consumption and low-noise devices for the removal of heat in confined spaces. The performance of piezoelectric fans has been studied by...
Chladni Figures Revisited Based on Nanomechanics (2007)
Dorrestijn, M., Bietsch, A., Acikalin, T., Raman, Arvind, Hegner, M., Meyer, E., ...
Chladni patterns based on nanomechanics in the microfluidic environment are presented. In contrast with the macroscopic observations in the gaseous environment, nanoparticles are found to move to the...
Piezoelectric fans using higher flexural modes for electronics cooling applications (2007)
Wait, Sydney M., Basak, Sudipta, Garimella , S V, Raman, Arvind
Piezoelectric fans are gaining in popularity as lowpower- consumption and low-noise devices for the removal of heat in confined spaces. The performance of piezoelectric fans has been studied by...
Characterization and optimization of the thermal performance of miniature piezoelectric fans (2007)
Acikalin, Tolga, Garimella , S V, Raman, Arvind, Petroski, James
Piezoelectric fans have emerged as a viable cooling technology for the thermal management of electronic devices, owing to their low- power consumption, minimal noise emission, and small and...
Hydrodynamic loading of microcantilevers vibrating in viscous fluids (2006)
Basak, Sudipta, Raman, Arvind, Garimella , S V
The hydrodynamic loading of elastic microcantilevers vibrating in viscous fluids is analyzed computationally using a three-dimensional, finite element fluid-structure interaction model. The quality...
Hydrodynamic loading of microcantilevers vibrating in viscous fluids (2006)
Basak, Sudipta, Raman, Arvind, Garimella, Suresh
The hydrodynamic loading of elastic microcantilevers vibrating in viscous fluids is analyzed computationally using a three-dimensional, finite element fluid-structure interaction model. The quality...
Parametric resonance based scanning probe microscopy (2006)
Moreno-Moreno, M., Raman, Arvind, Gomez-Herrero, J., Reifenberger, R.
We propose a mode of dynamic scanning probe microscopy based on parametric resonance for highly sensitive nanoscale imaging and force spectroscopy. In this mode the microcantilever probe is excited...
Parametric resonance based scanning probe microscopy (2006)
Moreno-Moreno, M., Raman, Arvind, Gomez-Herrero, J., Reifenberger, R.
We propose a mode of dynamic scanning probe microscopy based on parametric resonance for highly sensitive nanoscale imaging and force spectroscopy. In this mode the microcantilever probe is excited...
Ultrasensitive mass sensing using mode localization in coupled microcantilevers (2006)
Spletzer, Matthew, Raman, Arvind, Wu, Alexander Q., Xu, Xianfan, Reifenberger, R.
We use Anderson or vibration localization in coupled microcantilevers as an extremely sensitive method to detect the added mass of a target analyte. We focus on the resonance frequencies and...
Hydrodynamic Loading of Microcantilevers Vibrating in Viscous Fluids (2006)
Basak, Sudipta, Raman, Arvind, Garimella , S V
The hydrodynamic loading of elastic microcantilevers vibrating in viscous fluids is analyzed computationally using a three-dimensional, finite element fluid-structure interaction model. The...
Chaos in Atomic Force Microscopy (2006)
Chaotic oscillations of microcantilever tips in dynamic atomic force microscopy (AFM) are reported and characterized. Systematic experiments performed using a variety of microcantilevers under a wide...
Probing attractive forces at the nanoscale using higher-harmonic dynamic force microscopy (2005)
Crittenden, S., Raman, Arvind, Reifenberger, R.
We systematically investigate higher harmonics in the vibration spectrum of scanning force microscope cantilevers operating in the attractive regime. We show that a the magnitudes of the...
Imaging artefacts in atomic force microscopy with carbon nanotube tips (2005)
Strus, Mark C, Raman, Arvind, Nguyen, C. V
Dynamic atomic force microscopy (dynamic AFM) with carbon nanotube tips has been suggested as an enabling tool for high precision nanometrology of critical dimension features of semiconductor...
Lee, Hyung Woo, Kim, Soo Hyun, Kwak, Yoon Kun, Strus, Mark, Raman, Arvind, Han, Chang Soo
The cheap, simple and high yield nanoscale fabrication of CNT(Carbon Nanotubes)-attached SPM(Scanning Probe Microscopy) tip has been studied in this research. The electric field(AC or AC+DC) between...
Lee, S. I, Howell, S. W., Raman, Arvind, Reifenberger, R., Nguyen, C. V, Meyyappan, M.
The nonlinear dynamics of an atomic force microcantilever (AFM) with an attached multi-walled carbon nanotube (MWCNT) tip is investigated experimentally and theoretically. We present the experimental...
Microscale pumping technologies for microchannel cooling systems (2004)
Singhal, Vishal, Garimella, Suresh, Raman, Arvind
A review of the state of the art in micropumping technologies for driving fluid through microchannels is presented with a particular emphasis on small-scale cooling applications. An extensive variety...
Experimental Investigation of the Thermal Performance of Piezoelectric Fans (2004)
Acikalin, Tolga, Wait, Sydney M., Garimella , S V, Raman, Arvind
Piezoelectric fans are investigated as a cooling technology for the thermal management of electronic devices. Flow visualization experiments are conducted to better understand the physics of fan...
Dynamics and Topology Optimization of Piezoelectric Fans (2003)
Burmann, Philipp, Raman, Arvind, Garimella , S V
Piezoelectric fans are very low power, small, very low noise, solid-state devices that have recently emerged as viable thermal management solutions for a variety of portable electronics applications...
Dynamics and Topology Optimization of Piezoelectric Fans (2003)
Buermann, P, Raman, Arvind, Garimella , S V
Piezoelectric fans are very low power, small, very low noise, solid-state devices that have recently emerged as viable thermal management solutions for a variety of portable electronics applications...
A Low Complexity Error Concealment Scheme for MPEG-4 Coded Video Sequences (2001)
MPEG coded bit streams are very sensitive to channel disturbances due to variable length coding. A single bit error can lead to very severe degradation in that part or entire slice of the image. This...
On the large amplitude oscillations of disks spinning near critical speed / (1999)
Thesis (Ph. D. in Engineering-Mechanical Engineering)--University of California, Berkeley, Fall 1999.
Xu, Xin, Carrasco, Carolina, De Pablo, Pedro Jose, Gomez-Herrero, Julio, Raman, Arvind
Dynamic atomic force microscopy is widely used for the imaging of soft biological materials in liquid environments; yet very little is known about the peak forces exerted by the oscillating probe...