Electrical Engineering and Computer Science

Solid State Electronics Lab Seminar

Antimonide Based Infrared Detectors and Focal Plane Arrays

Sanjay Krishna

Ohio State University
Friday, April 21, 2017
10:00am - 11:30am
1200 EECS

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About the Event

Infrared imaging (3-25μm) has been an important technological tool for the past 60 years since the first report of infrared detectors in 1950s. There has been a dramatic progress in the development of infrared antimonide based detectors and low power electronic devices in the past decade with new materials like InAsSb, InAs/GaSb superlattices and InAs/InAsSb superlattices demonstrating very good performance. One of the unique aspects of the 6.1A family of semiconductors (InAs, GaSb and AlSb) is the ability to engineer the bandstructure to obtain designer band-offsets. Our group (www.krishnairlab.com) investigates fundamental challenges in antimonide based infrared detectors and explores new avenues for next generation infrared detectors, arrays and imagers. In this talk, I will describe some of the material science and device physics of the antimonide systems. I will describe some of the challenges in these systems including the identification of defects that limit the performance of the detector. The use of “unipolar barrier engineering” to realize high performance infrared detectors and focal plane arrays will be discussed. I will also explore the possibility of realizing the 4th Gen infrared imaging systems. Using the concept of a bio-inspired infrared retina, I will make a case for an enhanced functionality in the pixel. The key idea is to engineer the pixel such that it not only has the ability to sense multimodal data such as color, polarization, dynamic range and phase but also the intelligence to transmit a reduced data set to the central processing unit. I will also discuss some commercial applications of infrared imaging including the early detection of skin cancer.


Sanjay Krishna is the George R Smith Professor of Engineering in the ECE department at the Ohio State University. He was previously the Director of the Center for High Technology Materials and Professor and Regents Lecturer in the Department of Electrical and Computer Engineering at the University of New Mexico. Sanjay received his M.S. in Electrical Engineering in 1999 and PhD in Applied Physics in 2001 from the University of Michigan. He joined UNM as a tenure track faculty member in 2001. His group is involved with the development of next generation infrared detectors, arrays and imagers. Sanjay has received several awards including the Gold Medal from IIT, Madras, Defense Intelligence Agency Chief Scientist Award for Excellence, NAMBE Young Investigator Award, ISCS Young Scientist award and the UNM Teacher of the Year. Sanjay has more than 300 peer-reviewed journal articles (h-index=45), two book chapters and ten issued patents. He is the co-founder and CTO of SK Infrared, a start-up involved with the use of IR imaging for dual use applications including early detection of skin cancer. He is a Fellow of IEEE, OSA and SPIE

Additional Information

Sponsor(s): Nano Seminar Series

Open to: Public