Navigation Links
Tiny avalanche photodiode detects single UV photons
Date:1/28/2008

In a significant breakthrough, researchers at Northwestern Universitys Center for Quantum Devices (CQD) have demonstrated visible-blind avalanche photodiodes (APDs) capable of detecting single photons in the ultraviolet region (360-200 nm).

Previously, photomultiplier tubes (PMTs) were the only available technology in the short wavelength UV portion of the spectrum capable of single photon detection sensitivity. However, these fragile vacuum tube devices are expensive and bulky, hindering true systems miniaturization.

The Northwestern team, led by Manijeh Razeghi, Walter P. Murphy Professor of Electrical Engineering and Computer Science at Northwesterns McCormick School of Engineering, became the worlds first to demonstrate back-illuminated single photon detection from a III-nitride photodetector. These back-illuminated devices, based on GaN compound semiconductors, benefit from the larger ionization coefficient for holes in this material. The back-illumination geometry will facilitate future integration of these devices with read-out circuitry to realize unique single-photon UV cameras. Towards that end, the team has already demonstrated excellent uniformity of the breakdown characteristics and gain across the wafer.

The devices are coupled with a quenching circuit and operated under large reverse bias, an arrangement termed in Geiger mode operation. The sensor system presents an effective photocurrent gain greater than 107, single photon detection efficiencies of 23 percent, dark count rates of less than 1 kHz, and no response to visible radiation.

Once optimized, discrete detectors could be combined with the ultraviolet LEDs already pioneered by the Center for Quantum Devices to create an inexpensive detection system capable of identifying the unique spectral fingerprints of a biological agent attack. They can also be paired with UV LEDs to create a new form of non-line of sight UV-communication, secure from remote eavesd
'/>"/>

Contact: Kyle Delaney
k-delaney@northwestern.edu
847-467-4010
Northwestern University
Source:Eurekalert

Page: 1 2

Related biology technology :

1. Quantum device traps, detects and manipulates the spin of single electrons
2. Video and Photo: Tekturna HCT(R), a Single-tablet Combination of Tekturna(R)* and a Diuretic, Receives US Approval for Treatment of High Blood Pressure
3. Nanotechnology innovation may revolutionize gene detection in a single cell
4. Genzyme Receives European CE Mark for Single-Treatment Synvisc-One(TM)
5. Faster X-ray interferometers due to single-photon interference
6. Model for the assembly of advanced, single-molecule-based electronic components developed at Pitt
7. Worlds smallest radio uses single nanotube to pick up good vibrations
8. Thermo Fisher Scientific to Expand Manufacturing Operation for Single-Use Bioprocessing Containers
9. Genmab Amends Ofatumumab Pivotal Study in NHL to Single Arm Study
10. BioNanomatrix Announces Issuance of Key Nanofluidics Patent Enabling Single Molecule Whole Genome Analysis
11. NIH Announces Advanced Cell Technologys Single Cell Embryo Biopsy Technique as a Means to Derive Embryonic Stem Cells to be Considered for Federal Funding
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/15/2014)... 2014 ­ RedBrick Health , a fast-growing leader ... announces that EmblemHealth , the New ... now providing the RedBrick Compass health assessment, combined with ... of its members. EmblemHealth is among the first health ...
(Date:1/15/2014)... January 15, 2014 The Microcompetition with Foreign ... disease. One of these latent viruses is the Epstein Barr ... (RA). Rheumatoid arthritis (RA) is a chronic inflammatory disease that ... study found that RA patients have high concentrations of EBV ...
(Date:1/15/2014)... Jan. 15, 2014 TaiGen Biotechnology Company, Limited ("TaiGen") ... with R-Pharm, a leading Russian pharmaceutical company, to develop ... Russian Federation , Turkey ... (CIS). Nemonoxacin is a novel antibiotic for the treatment of ...
(Date:1/14/2014)... owners drew up their lists of New Year,s resolutions for 2014, ... my furry companion." Nowadays there are pet salons, dog and cat ... the little canine or feline darlings along wherever mommy or daddy ... toys at the pet store. But anyone who has ever lived ...
Breaking Biology Technology:EmblemHealth Selects RedBrick Health to Power its Next-Generation Health Engagement and Behavior Change System 2EmblemHealth Selects RedBrick Health to Power its Next-Generation Health Engagement and Behavior Change System 3Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 2Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 2TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 4New Year's Resolution: Give Pets the Gift of Top-Notch Health Care 2
... 16 /Xinhua-PRNewswire-FirstCall/ -- Pharmaxis (ASX: PXS;,Nasdaq: PXSL) today ... for its asthma management product, Aridol., "This ... Pharmaxis Chief,Executive Officer Dr Alan Robertson. "Korea is ... Aridol in Asia. There are an estimated 2.5 ...
... cheaper and more efficient is the aim of a ... and Q1 NanoSystems. The university and the company, based ... exclusive licensing of a package of jointly-owned intellectual property ... The agreement covers inventions that enable manufacture of very ...
... GPRO ) announced today that the Company will ... on Wednesday, February 13,2008 at approximately 4:00 p.m. Eastern ... call at 4:30 p.m. ET hosted by Henry L. ... senior,vice president, finance, and chief financial officer., The ...
Cached Biology Technology:Pharmaxis' Aridol Gains First Asian Approval 2Solar energy technology licensed 2Gen-Probe Announces Webcast of Fourth Quarter and Full Year 2007 Earnings Conference Call 2
(Date:4/17/2014)... A drug under clinical trials to treat tuberculosis could ... that act against various bacteria, fungal infections and parasites, ... of Illinois chemists and collaborators. , Led by U. ... the different ways the drug SQ109 attacks the tuberculosis ... other pathogens from yeast to malaria and how ...
(Date:4/17/2014)... 2014. Kessler Foundation has been named awardee of ... Department of Defense Spinal Cord Injury Research Program. ... the randomized, double-blinded, controlled, multi-site clinical trial, which ... strength after spinal cord injury. Dr. Forrest is ... at Kessler Foundation. Two additional sites will participate ...
(Date:4/17/2014)... Down syndrome - or trisomy 21 - is the ... from a chromosomal abnormality where cells of affected individuals ... the human genome). A study conducted by Stylianos Antonarakis ... and Development at the University of Geneva (UNIGE) Faculty ... on how the extra chromosome 21 upsets the equilibrium ...
Breaking Biology News(10 mins):Multitarget TB drug could treat other diseases, evade resistance 2Kessler Foundation awarded Department of Defense grant for spinal cord injury research 2Trisomy 21: How an extra little chromosome throws the entire genome off balance 2Trisomy 21: How an extra little chromosome throws the entire genome off balance 3
... is fit and well? This is a question which has ... have come up with the answer - using DNA chips. ... UK universities are developing a DNA chip to monitor the ... save the salmon industry thousands and also help conserve dwindling ...
... notable effect on rates of pregnancy and abortion, according to ... emergency contraception is questioned by Professor Anna Glasier, director of ... NHS Trust, Edinburgh, who says it does help some women ... pregnant. , Use of this form of contraception has increased ...
... broccoli was good for you, she just didn't know it ... you and that it contains compounds known to lessen the ... how these compounds work and what their specific targets may ... at the University of Virginia School of Medicine. , ...
Cached Biology News:Special chip provides better picture of salmon health 2Special chip provides better picture of salmon health 3
BD BioCoat Poly-D-Lysine 60 mm Culture Dishes, tissue-culture treated polystyrene with a uniform application of poly-D-lysine....
... Ciphergens ProteinChip System, Series 4000 incorporates the ... researchers and biologists in biomarker research. The ... fastest route for converting biomarker discoveries to ... The Series 4000 is designed to fit ...
Gelatin 100 mm Culture Dishes...
BD Primaria 100 mm Cell Culture Dish, surface-modified polystyrene for enhanced cell culture. (200/ca) Packaging: 20 / sleeve, 200 / case ...
Biology Products: