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Developing Self-replicating Nanoscale Origami

08-06-13

William A. Goddard III, Charles and Mary Ferkel Professor of Chemistry, Materials Science, and Applied Physics, and colleagues including Postdoctoral Scholar Si-ping Han have been awarded a $2 million grant as part of the National Science Foundation’s Origami Design for Integration of Self-assembling Systems for Engineering Innovation program. The funds will be used to develop biomimetic materials which contain assembled complexes of molecules that self-replicate, evolve and adopt intricate three dimensional structures at the nanometer scale by combining DNA guided self-assembly with origami folding.

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Tags: APhMS research highlights health William Goddard Paul Rothemund Si-ping Han postdocs

A New Tool for Secret Agents—And the Rest of Us

12-10-12

Ali Hajimiri, Thomas G. Myers Professor of Electrical Engineering, and Postdoctoral Scholar in Electrical Engineering, Kaushik Sengupta, have developed tiny inexpensive silicon microchips that generate terahertz (THz) waves that fall into a largely untapped region of the electromagnetic spectrum and that can penetrate a host of materials without the ionizing damage of X-rays. When incorporated into handheld devices, the new microchips could enable a broad range of applications in fields ranging from homeland security to wireless communications to health care, and even touchless gaming. "This extraordinary level of creativity, which has enabled imaging in the terahertz frequency range, is very much in line with Caltech's long tradition of innovation in the area of CMOS technology," says Chair Ares Rosakis. "Caltech engineers, like Ali Hajimiri, truly work in an interdisciplinary way to push the boundaries of what is possible." [Caltech Release]

Tags: EE energy research highlights MedE health Ali Hajimiri Kaushik Sengupta postdocs

Point of Light

12-07-12

Hyuck Choo, Assistant Professor of Electrical Engineering, and Postdoctoral Scholar Myung-Ki Kim have invented a light-focusing device that may lead to applications in computing, communications, and imaging. This new kind of waveguide is made of amorphous silicon dioxide and is covered in a thin layer of gold. Just under two microns long, the device is a rectangular box that tapers to a point at one end. With the new device, light can ultimately be focused in three dimensions, producing a point a few nanometers across, and using half of the light that's sent through, Choo says. (Focusing the light into a slightly bigger spot, 14 by 80 nanometers in size, boosts the efficiency to 70 percent). The key feature behind the device's focusing ability and efficiency, he says, is its unique design and shape. [Caltech Release and Video]

Tags: EE energy research highlights Hyuck Choo Myung-Ki Kim postdocs

Material's Spacing is Key to Brittle-to-ductile Transition

07-16-12

Julia R. Greer, her postdoctoral scholar Dr.Dongchan Jang, and colleagues have used experiments and atomistic simulations of nano-twinned metals (which have the unique combined effect of being strong and ductile) to decipher the specific role of the twin boundaries. They have found that it is the spacing between the twin boundaries that determines whether a material is brittle or ductile as opposed to the sample size, as would be expected. Greer states "this is probably the first study that truly isolated the twin boundaries by making samples which contained only twin boundaries, periodically spaced throughout the sample, and then tested them in tension. This understanding will help in the design of better structural materials and provide a certain amount of predictability in doing so, which has not been possible to date." [Nature Nanotechnology Article and Movies]

Tags: APhMS research highlights Julia Greer Dongchan Jang postdocs

Fueling Fundamental Research

10-13-11

To strengthen fundamental science and technology and foster transformational advances in renewable energies, the Dow Chemical Company and Caltech have established a $10 million partnership. Under the partnership, Dow will provide ongoing support for graduate student research through endowed fellowships which include five in energy science. The Resnick Sustainability Institute is receiving a significant portion of the funding in the agreement. Through the new Dow Chemical Company Bridge/CI2 Innovation Program, financial support will be used to further promising graduate and postdoc research that has the possibility of creating licensable technologies and start-ups. The graduate research fellowships in energy—renewable for up to two years—will help advance clean-energy goals. [Caltech Press Release]

Tags: APhMS energy Resnick Dow postdocs

Nano-mechanics of Carbon Nanotube Research Wins Art Competition

08-22-11

Siddhartha (Sid) Pathak, a W. M. Keck Institute for Space Studies (KISS) Postdoctoral Fellow in Material Science, has received the first prize in the NanoArt 2011 International Competition. The inspiration for Dr. Pathak's entry entitled "In-situ SEM deformation of CNT micro-pillars" is his research on nano-mechanics of carbon nanotubes.  As a KISS postdoc Dr. Pathak is working with  Professor Julia Greer on mechanical testing of carbon nanotubes at submicron length scales, with a particular emphasis towards space applications.  

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Tags: APhMS energy research highlights Julia Greer KISS Siddhartha Pathak postdocs

Computer Scientists Assist with Conservation Planning

08-16-11

Postdoctoral Scholar Daniel R. Golovin and colleagues including Professor Andreas Krause have won the Outstanding Paper Award in the Computational Sustainability and Artificial Intelligence Track at the 2011 Association for the Advancement of Artificial Intelligence (AAAI) Conference  for their paper entitled Dynamic Resource Allocation in Conservation Planning. The paper was selected from 975 submissions.  It addresses how computer science (in particular machine learning and adaptive optimization) can help conservation planning, by making recommendations about how to best protect rare species. [Read the paper]

Tags: honors CMS Andreas Krause Daniel Golovin postdocs

Engineers Solve Longstanding Problem in Photonic Chip Technology

08-04-11

Liang Feng, a Postdoctoral Scholar in Electrical Engineering who works with Professor Axel Scherer, has designed a new type of optical waveguide - a 0.8-micron-wide silicon device. The waveguide allows light to go in one direction but changes the mode of the light when it travels in the opposite direction. This new technique to isolate light signals on a silicon chip, solves a longstanding problem in engineering photonic chips. [Caltech Press Release]

Tags: APhMS EE energy research highlights Liang Feng Axel Scherer postdocs

One-way Transmission System for Sound Waves

07-26-11

Postdoctoral scholar, Georgios Theocharis, and GALCIT alumnus Nicholas Boechler; working with Professor Chiara Daraio, have created the first tunable acoustic diode- a device that allows acoustic information to travel only in one direction, at controllable frequencies. [Caltech Press Release]

Tags: APhMS energy research highlights Chiara Daraio GALCIT Georgios Theocharis Nicholas Boechler postdocs

Best Paper Finalist in Robotics

07-24-11

Marin Kobilarov, a W. M. Keck Institute for Space Studies Postdoctoral Fellow, was a finalist for the best paper award in the 2011 Robotics: Science and Systems Conference - his paper is entitled Cross-Entropy Randomized Motion Planning .  The conference committee solicited original papers in all areas of robotics and followed a highly selective review process designed to select the best work of its kind in every category. Dr. Kobilarov is working on discrete geometric motion control of autonomous vehicles with Professors Mathieu Desbrun and Sergio Pelligrino.  [Read the paper]

Tags: honors GALCIT CMS Mathieu Desbrun Marin Kobilarov Sergio Pelligrino KISS postdocs