Navigation Links
Penn researchers break light-matter coupling strength limit in nanoscale semiconductors
Date:6/15/2011

atter coupling strength is pretty constant," Agarwal said. "But, if you try to go below 500 nanometers or so, what we have shown is that this coupling strength increases dramatically."

The difference is a function of one of nanotechnology's principle phenomena: the traits of a bulk material are different than structures of the same material on the nanoscale.

"When you're working at bigger sizes, the surface is not as important. The surface to volume ratio the number of atoms on the surface divided by the number of atoms in the whole material is a very small number," Agarwal said. "But when you make a very small structure, say 100 nanometers, this number is dramatically increased. Then what is happening on the surface critically determines the device's properties."

Other researchers have tried to make polariton cavities on this small a scale, but the chemical etching method used to fabricate the devices damages the semiconductor surface. The defects on the surface trap the excitons and render them useless.

"Our cadmium sulfide nanowires are self-assembled; we don't etch them. But the surface quality was still a limiting factor, so we developed techniques of surface passivation. We grew a silicon oxide shell on the surface of the wires and greatly improved their optical properties," Agarwal said.

The oxide shell fills the electrical gaps in the nanowire surface, preventing the excitons from getting trapped.

"We also developed tools and techniques for measuring this light-matter coupling strength," Piccione said. "We've quantified the light-matter coupling strength, so we can show that it's enhanced in the smaller structures,"

Being able to quantify this increased coupling strength opens the door for designing nanophotonic circuit elements and devices.

"The stronger you can make light-matter coupling, the better you can make photonic switches," Agarwal said. "Electrical transistors work because
'/>"/>

Contact: Evan Lerner
elerner@upenn.edu
215-573-6604
University of Pennsylvania
Source:Eurekalert

0

GOOD

Page: 1 2 3

Related biology technology :

1. Understanding the science of solar-based energy: more researchers are better than one
2. Researchers decode viral process that prepares cells for HIV infection
3. Dartmouth researchers advance cellulosic ethanol production
4. Researchers develop new model for cystic fibrosis
5. Use it or lose it? Researchers investigate the dispensability of our DNA
6. Sigma-Aldrich and the University of Illinois Offer New Boronic Acid Surrogates to Researchers Worldwide Through Licensing Agreement
7. Researchers write protein nanoarrays using a fountain pen and electric fields
8. Researchers show how to stamp nanodevices with rubber molds
9. The Lancets New Online Medical Journal Helps Clinicians and Medical Researchers Find Practice-Changing Evidence Quickly and Easily
10. Ultrafast lasers give CU-Boulder researchers a snapshot of electrons in action
11. VAP(R) Cholesterol Test Helps Researchers Identify Treatment Effects of Combination Therapy
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/23/2013)... 2013  Verenium Corporation (Nasdaq: VRNM ), ... and commercialization of high-performance enzymes, today announced that ... present at two upcoming conferences. (Logo: ... the Second Annual Marcum LLP Microcap Conference on Thursday, ... New York City.  The presentation is scheduled to begin ...
(Date:5/23/2013)... South Korea , May 23, 2013 /PRNewswire/ ... with SillaJen, Inc., a private biotherapeutics and contract ... targeted biological products for cancer, announced today a ... in patients treated with the oncolytic and immunotherapeutic ... This research was published in the May ...
(Date:5/23/2013)... (PRWEB) May 23, 2013 ... ancestry tracing for people of African descent, today ... product offering. For people of all races, myDNAmix ... from five distinct populations: Indigenous Americas (Native American), ... India Subcontinent. , Originally launched in ...
(Date:5/23/2013)... Bed bugs compromised Penn State. ... confirmed it. Meanwhile, My Cleaning Products offered complimentary samples of ... the pests without using harmful chemical elements. , Based ... the affected building was actually a dormitory , My ... made on May 13 and bed bug presence was confirmed ...
Breaking Biology Technology:Verenium To Present At Two Upcoming Conferences 2Verenium To Present At Two Upcoming Conferences 3Pusan National University Announces Science Translational Medicine Publication Highlighting Landmark Demonstration of Functional Anti-Cancer Antibody Induction in Patients Following JX-594 Treatment 2Pusan National University Announces Science Translational Medicine Publication Highlighting Landmark Demonstration of Functional Anti-Cancer Antibody Induction in Patients Following JX-594 Treatment 3AfricanAncestry.com Rolls Out Improved MyDNAMix Admixture Test for People of all Races; Enhancements Increase Accuracy in Estimation of Ancestral Makeup 2AfricanAncestry.com Rolls Out Improved MyDNAMix Admixture Test for People of all Races; Enhancements Increase Accuracy in Estimation of Ancestral Makeup 3Penn State Dorm Infested with Bed Bugs, My Cleaning Products Offers Complimentary Sample of Bed Bug Spray to Help Bed Bug Victims 2
... Emphasis on Drug Development and Recent ... Private Equity ... (Nasdaq: LXRX ) announced several changes to the,composition of ... and the completion of a major strategic financing,with Invus, LP. ...
... Sept. 25 NanoBio(R) Corporation, a,biopharmaceutical company developing ... prevent serious infections, today announced,the addition of four ... Lyou-fu Ma, PharmD, Ph.D.; Susan Ciotti, Ph.D.; Robert ... NanoBio in developing and commercializing,its novel topical anti-infectives ...
... SeqWright, Inc., an international,leader in the field ... Applied Biosystems (ABI) to purchase ABI,s next generation,SOLiD(TM) ... to offer commercial access to the latest in ... between,SeqWright and ABI that grows stronger with time. ...
Cached Biology Technology:Lexicon Appoints Judith Swain, M.D. to Board of Directors 2Lexicon Appoints Judith Swain, M.D. to Board of Directors 3Lexicon Appoints Judith Swain, M.D. to Board of Directors 4NanoBio Expands Drug Development Team for Its Anti-Infective Products 2NanoBio Expands Drug Development Team for Its Anti-Infective Products 3SeqWright Unveils ABI SOLiD(TM) Next Generation Genetic Analysis System 2
(Date:5/23/2013)... HOUSTON (May 23, 2013) A new report ... responsible for helping pupils engage in at least 60 ... school day. , No more than half of American ... hour of vigorous or moderate intensity physical activity daily, ... , "Because children are in school for nearly half ...
(Date:5/23/2013)... and fastest growing open-access publishers, announces the launch ... and Biotechnology . , A broad scope ... and Biotechnology will provide a single open-access ... research to be disseminated and discussed. , ... provide an open-science and interactive web platform for ...
(Date:5/22/2013)... 2013 U.S. Forest Service scientists are part of ... from the TKF Foundation, will examine how collaborative planning ... recover from tragedy. , The TKF Foundation announced today ... selected for grant funding. In addition to research on ... recovery and resiliency, the 3-year, $585,000 grant will contribute ...
Breaking Biology News(10 mins):Schools should provide students with daily physical activity, IOM recommends 2Frontiers launches new open-access journal in Bioengineering and Biotechnology 2'Landscapes of Resilience' to study how people use nature as a source of recovery 2
... 160 participants gathered this week for the seventh ... year,s topic, "Synthetic Biology," brought together scientists, engineers, ... and social issues surrounding the emerging field of ... molecular biology at Princeton University and this year,s ...
... 2009 -- A USDOE and USDA study concluded that ... cropland pasture could be converted from current uses to ... which biomass could be harvested for use as a ... monoculture from which substantial quantities of biomass are removed ...
... string of recent discoveries about the multiple health benefits of ... awareness of the huge numbers of people who are deficient ... of it as "nature,s antibiotic." On issues ranging from ... disease and even vulnerability to influenza, vitamin D is now ...
Cached Biology News:Synthetic biology offers new opportunities for interdisciplinary collaboration 2Switchgrass produces biomass efficiently 2Multiple health concerns surface as winter, vitamin D deficiences arrive 2Multiple health concerns surface as winter, vitamin D deficiences arrive 3
...
DryStrip aligners, 4. Category: Electrophoresis Systems & Standards & Reagents, IEF & SDS-PAGE & 2-D Electrophoresis, Multiphor II Kits & Components and Accessories....
...
... PGE1-d4 contains 4 deuterium atoms at the ... is intended for use as an internal ... GC- or LC-mass spectrometry. PGE1 is the ... but it is virtually undetectable in the ...
Biology Products: