Navigation Links
Tiny avalanche photodiode detects single UV photons

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
Northwestern University

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:
(Date:11/25/2015)... 25, 2015 The Global ... a professional and in-depth study on the current ... (Logo: ) , The ... including definitions, classifications, applications and industry chain structure. ... international markets including development trends, competitive landscape analysis, ...
(Date:11/24/2015)... , Nov. 24, 2015 Cepheid (NASDAQ: ... speaking at the following conference, and invited investors to ... NY      Tuesday, December 1, 2015 at 11.00 ... NY      Tuesday, December 1, 2015 at 11.00 ... Conference, New York, NY      Tuesday, ...
(Date:11/24/2015)... Tampa, Florida (PRWEB) , ... November 24, 2015 ... ... its biggest event of the year and one of the premier annual events ... USA, and ran from 8–11 November 2015, where ISPE hosted the largest number ...
(Date:11/24/2015)... ... ... This fall, global software solutions leader SAP and AdVenture Capital brought together dozens ... BIG ideas to improve health and wellness in their schools. , Now, the top ... of SAP's Teen Innovator, an all-expenses paid trip to Super Bowl 50, and an ...
Breaking Biology Technology:
(Date:10/29/2015)...  Connected health pioneer, Joseph C. Kvedar , ... health and wellness, and the business opportunities that arise ... Internet of Healthy Things . Long before health ... Dr. Kvedar, vice president, Connected Health, Partners HealthCare, was ... care from the hospital or doctor,s office into the ...
(Date:10/29/2015)... , Oct. 29, 2015 Today, ... announced a partnership with 2XU, a global leader ... deliver a smart hat with advanced bio-sensing technology. ... other athletes to monitor key biometrics to improve ... strategic partnership, the two companies will bring together the ...
(Date:10/27/2015)... , October 27, 2015 ... Automated Semantic Gaze Mapping technology (ASGM) automatically maps data ... Eye Tracking Glasses , so that they can ... --> Munich, Germany , October ... automatically maps data from mobile eye tracking videos created ...
Breaking Biology News(10 mins):