aspuru-list March 2011

aspuru-list@lists.fas.harvard.edu

29 participants
86 discussions

[Aspuru-Guzik group list] meeting with Hatice Altug

by Semion Saikin

Dear Group, we have a meeting with Prof. Hatice Altug http://www.bu.edu/ece/people/faculty/a-g/hatice-altug/ scheduled for tomorrow, Thursday, March 3 between 9 and 10am. If somebody is interested to talk about biosensors, welcome to join. The formal place for the meeting is M-105 but we can move to the open area near Alan's office. best, Semion -- ******************************************** Semion K. Saikin, PhD Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street, Cambridge, MA 02138 email: saykin(a)fas.harvard.edu phone: (619)212-6649 ********************************************

13 years, 2 months

[Aspuru-Guzik group list] ANNOUNCEMENT: Excitonics Seminar, Mar 8, 3 pm, 36-428

by Cathy Bourgeois

Please forward to your groups and post in your area ______________________________________ Center for Excitonics Seminar Series Announcement Tuesday, March 8, 2011 3:00 PM RLE Conference Room: 36-428 Vinod M Menon, Queens College of CUNY "CONTROL OF LIGHT-MATTER INTERACTION USING DISPERSION ENGINEERED PHOTONIC STRUCTURES" Abstract: Coherent interaction of an ensemble of dipole active atoms or excitons with vacuum electromagnetic field has been studied extensively since its initial conception by Dicke in 1954. However, when the emitters are not only periodically arranged, but are also placed in a periodically modulated dielectric environment, the interaction between them is carried by the electromagnetic Bloch waves of the photonic crystal. This coherent interaction results in the formation of strongly coupled light-matter quasiparticles called Bloch polaritons. In this talk I will discuss our recent work demonstrating the formation of such quasiparticles in a periodically arranged multiple quantum well system. Tuning of these polariton states using electric field and its application for switching and slow light enhanced nonlinear optics will also be discussed. Following this I will discuss our recent work on dispersion engineered metamaterials for controlling the spontaneous emission rate of quantum dots. Unlike microcavity structures that rely on localization of electromagnetic field for increase in the photon density of states, the present work exploits the flat dispersion in anisotropic materials to create more states for the emitter to emit through. Finally I will briefly discuss our work on nonreciprocal optical elements realized using quasiperiodic photonic crystals embedded with colloidal quantum dots. Bio: Dr. Vinod. M. Menon is an Associate Professor of Physics at Queens College and Graduate Center of the City University of New York (CUNY). He joined CUNY as part of the Photonic Initiative in 2004. Prior to joining CUNY he was a research staff member at Princeton University (2003-04). He joined Princeton as the Lucent Bell Labs Post Doctoral Fellow in Photonics in 2001. He received his MSc in Physics from the University of Hyderabad, India in 1995 and his Ph.D. in Physics from the University of Massachusetts in 2001. His current research interests include the development of classical and non-classical light sources using quantum dots, metamaterials for controlling light-matter interaction, and engineered nonlinear optical materials using hybrid nanocomposites.

13 years, 2 months

[Aspuru-Guzik group list] TODAY at 5pm: Future of Energy with Sharon Burke - "Energy for the War Fighter"

by Center for the Environment

Finding secure, safe and reliable sources of energy to power world economic growth will be one of the great challenges of this century. The Harvard University Center for the Environment invites the Harvard community to take up the challenge by participating in this ongoing series of discussions. THE FUTURE OF ENERGY Spring 2011 "Energy for the War Fighter" Sharon Burke, Assistant Secretary of Defense for Operational Energy Plans & Programs, U.S. Department of Defense TODAY 5:00 pm Harvard University Science Center D 1 Oxford Street, Cambridge Today's wars in Iraq and Afghanistan have reminded us of an age old lesson: an assured, reliable supply of energy is critical to prevailing in conflict. While the military services are taking actions to address the complex energy questions that affect our current wars, opportunities exist to improve our Armed Forces' capability through better use of operational energy in theater. Assistant Secretary of Defense Sharon Burke will discuss the steps the U.S. Military is to improve our energy posture, from innovative efforts to reduce demand using current technologies to cutting edge approaches using tomorrow's innovations to increase supply. Burke will discuss the strategic imperatives for the Nation, the underlying challenges for Defense Department and will conclude with her thoughts about how energy will transform the way we fight. The Future of Energy lecture series is sponsored by the Harvard University Center for the Environment with generous support from Bank of America. All of the lectures are free and open to the public. View detailed lecture information at www.environment.harvard.edu. Contact: Brenda Hugot Program Administrator Harvard University Center for the Environment 24 Oxford Street Cambridge, MA 02138 bhugot(a)fas.harvard.edu p. 617-496-1788 f. 617-496-0425 *|LIST:Future of Energy|* [2]Unsubscribe aspuru-list(a)lists.fas.harvard.edu from this list. Links: 2. http://harvard.us1.list-manage.com/unsubscribe?u=7532d1fbf18f39219ac742ebe&… Our mailing address is: 24 Oxford St. Cambridge, MA 02138 T: (617) 495-0368 www.environment.harvard.edu Copyright (C) 2008 Harvard University. All rights reserved. [3]Forward this email to a friend Links: 3. http://us1.forward-to-friend2.com/forward?u=7532d1fbf18f39219ac742ebe&id=c5…

13 years, 2 months

[Aspuru-Guzik group list] Pizza in the big office

by Jacob J Krich

Help yourselves. There's chicken parm and mushroom & onion slices. Also some soda.

13 years, 2 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] OPV folks: Talk by Michael McGehee March 8

by Tamar Mentzel

Hi All, This talk by Michael McGehee at MIT on March 8 might interest folks who are interested in OPVs, solar cells, etc. See below for details. Tamar From: energy_colloquium-bounces(a)MIT.EDU [mailto: energy_colloquium-bounces(a)MIT.EDU] On Behalf Of MIT Energy Initiative Sent: Tuesday, March 01, 2011 11:21 AM To: energy colloquium Subject: [Energy_colloquium] March 8 - Organic and Dye Sensitized Solar Cells - Michael McGehee [cid:~WRD000.jpg]<http://web.mit.edu/mitei/news/seminars/<https://webmail.mit.edu/horde/services/go.php?url=http%3A%2F%2Fweb.mit.edu%…> > Organic and Dye Sensitized Solar Cells Michael McGehee Associate Professor of Materials Science and Engineering and Director of the Center for Advanced Molecular Photovoltaics, Stanford University Tuesday, March 8 4:15 PM Room 66-110 <http://whereis.mit.edu/?go=66<https://webmail.mit.edu/horde/services/go.php?url=http%3A%2F%2Fwhereis.mit.…> > [cid:image001.jpg@01CBD808.06E6AD30] Abstract Organic solar cells and dye sensitized solar cells are very promising because they can be deposited rapidly in roll-to-roll coating machines without expensive vacuum chambers or high temperature processing. Since they can be lightweight and flexible, it may soon be possible to roll them onto rooftops at a cost several times lower than is now possible with silicon or cadmium telluride solar cells. Since organic semiconductors do not contain any rare or toxic elements, such as indium, cadmium or tellurium, organic solar cells could be used to provide the world with a significant fraction of its electricity. My research group has used synchrotron x-ray diffraction and other characterization techniques to reveal in detail how semiconducting polymer chains and fullerene molecules pack in solar cells and shown how this packing influences the electronic processes that determine how well solar cells work. We have also measured the lifetime of polymer solar cells and found it to be as high as 7 years. We have also pioneered the use of long range Forster energy transfer to improve light absorption in solar cells. We believe that the incorporation of energy relay dyes into dye sensitized solar cells (DSCs) is going to make it possible to raise their efficiency from 11 to 15% in the next few years by extending the region of the spectrum that the cells can absorb farther out into the infrared, where almost half of the sun's energy is located. One of the great challenges to making highly efficient solar cells with solution deposited films that have high defect densities is keeping the films thin so the charge carriers can be collected before recombination occurs while at the same time absorbing all of the light. We have recently demonstrated that absorption and power conversion efficiency can be increased by as much as 20% simply by nanoimprinting an array of domes into the active layer before depositing a silver electrode so that incoming light can be coupled into plasmonic modes that travel in the plane of the solar cell. About the speaker Michael D. McGehee is an Associate Professor in the Materials Science and Engineering Department and Director of the Center for Advanced Molecular Photovoltaics at Stanford University. His research interests are patterning materials at the nanometer length scale, semiconducting polymers, large area electronics and renewable energy. He has taught courses on nanotechnology, organic semiconductors, polymer science and solar cells. He received his undergraduate degree in physics from Princeton University and his PhD degree in Materials Science from the University of California at Santa Barbara, where he did research on polymer lasers in the lab of Nobel Laureate Alan Heeger. He did postdoctoral research with Galen Stucky and Brad Chmelka at the University of California at Santa Barbara on the self-assembly of organic-inorganic mesostructures. He has won the 2007 Materials Research Society Outstanding Young Investigator Award and the Mohr Davidow Innovators Award. The Seminar Series is made possible with the generous support of IHS-CERA [cid:image002.jpg@01CBD808.06E6AD30] _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

13 years, 2 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] seminars today

by Johannes Hachmann

Hi everybody, Here are two seminars today which may be of interest to people: 1) Barry Masters (MIT): Resonance energy transfer theories: from experiments to classical theory to quantum mechanical theories Noon Grier Room, MIT Bldg 34-401 Resonance energy transfer is a powerful technique to measure distances and structural changes in the nanometer scale. The plethora of applications of this technique to chemistry, biology and medicine is a metric of the impact of this optical technique. Scientists often use the textbook formulations of the rate equations; however, sometimes without a critical understanding of the inherent assumptions and limitations of the theory, to derive quantitative conclusions. Where did these mathematical formulations of resonance energy transfer come from? What experiments indicated the existence of the phenomena? This talk provides insights into the theoretical developments and the experiments of all the scientists who came before Theodor Förster. I have reviewed the French and German papers that described the physics of energy transfer. The theorists and the experimentalists include: the Perrins (father and son), Heisenberg (1926-his paper on energy transfer between two harmonic oscillators), Kallmann and London, Förster's Classical theory of Resonance Energy Transfer (1946), Förster Quantum Theory of resonance Energy Transfer (1948), Oppenheimer and Arnold (1950), and Hans Kuhn. I describe the physical aspects of these theories, the approximations used (dipole-dipole interactions; vibronic interactions etc) and the mathematics of their theories. Finally, how were each of these theories validated (or not) by experimental results. What are the limitations of each theory and when are they inappropriately used? Refreshments served after the lecture 3) Prof Hans-Joachim Freund (MPI): Thin oxide films: charge transfer and catalysis! 8:00 p.m. Pfizer Lecture Hall, Harvard Chemistry Best Johannes ----------------------------------------------- Dr. Johannes Hachmann Postdoctoral Fellow Aspuru-Guzik Research Group Harvard University Department of Chemistry and Chemical Biology 12 Oxford St, Rm M104A Cambridge, MA 02138 USA eMail: jh(a)chemistry.harvard.edu ----------------------------------------------- _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

13 years, 2 months

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aspuru-list March 2011