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 eavesdropping.


'/>"/>

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

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:2/4/2016)... Feb. 4, 2016  CytoSorbents Corporation (NASDAQ: ... its flagship CytoSorb® blood filter to treat deadly ... the world, announced that CEO Dr. Phillip ... Source Capital Group,s 2016 Disruptive Growth & Healthcare ... company.  Conference Presentation Details: ...
(Date:2/4/2016)... -- ContraVir Pharmaceuticals, Inc. (NASDAQ: CTRV ), a ... targeted antiviral therapies, announced today that it will present ... held February 8-9, 2016, at the Waldorf Astoria New ... Healthcare Conference, taking place in New York ... Sapirstein , Chief Executive Officer of ContraVir, will provide ...
(Date:2/4/2016)... ... 04, 2016 , ... Franz Inc. , an early ... has been recognized As “ Best in Semantic Web Technology - USA & ... America, it’s our priority to showcase prominent professionals who are excelling in their ...
(Date:2/3/2016)... SAN DIEGO , Feb. 3, 2016 /PRNewswire/ ... medicine company with the first pluripotent stem cell-derived ... 1 diabetes in clinical-stage development, today announced that ... Janssen Pharmaceutical Companies of Johnson & Johnson, have ... BetaLogics group into ViaCyte.  The agreement provides ViaCyte ...
Breaking Biology Technology:
(Date:1/21/2016)... , January 21, 2016 ... to a new market research report "Emotion Detection and ... Others), Software Tools (Facial Expression, Voice Recognition and ... - Global forecast to 2020", published by MarketsandMarkets, ... expected to reach USD 22.65 Billion by 2020, ...
(Date:1/18/2016)... Calif. , Jan. 18, 2016  Extenua ... software that simplifies the use and access of ... and go-to-market partnership with American Cyber.  ... brings extensive experience leading transformational C4ISR and Cyber ... and integrating the latest proven technology solutions," said ...
(Date:1/11/2016)... 11, 2016 Synaptics Incorporated (NASDAQ: SYNA ... announced that its ClearPad ® TouchView ™ ... two separate categories in the 8 th Annual ... Technology Breakthrough. The Synaptics ® TDDI solution enables ... chain, thinner devices, brighter displays and borderless designs. ...
Breaking Biology News(10 mins):