Private: “Novel Detector Architectures for Multispectral Imaging”


November 21, 2013

Dr. Enrico Bellotti

Boston University Electrical and Computer Engineering Dept.

When: Monday, November 25, 2013 at 3:05 p.m.
Where: Warnock 1250

Abstract

In a drive to increase sensor resolution, decrease per‐unit costs, and enable more efficient systems, recent research has focused on the development of detectors with pixel pitch below 10 μm. However, there are significant challenges associated with the design of wavelength‐sized detectors. Both inter‐pixel optical effects and intra‐pixel crosstalk can become non‐negligible but are nonetheless difficult to quantify. Due to the time and cost required to fabricate such devices, numerical simulation models must be employed to accurately predict device characteristics and evaluate designs. In this talk we will present our numerical method, sequential electromagnetic/Monte‐Carlo/drift‐diffusion analyses performed using the finite‐difference time‐domain/particle based/finite‐element methods, respectively. We then apply our model to study several relevant detector architectures. We will discuss our recent work on single, two color and APD detectors as well as photon trapping structures. Furthermore, we show how the model can be used to predict the effects of detector geometry, dopant/molar profiles, etc. on measurable quantities such as spectral response, current‐voltage characteristics, the modulation transfer function, and other figures of merit.

This work has been supported by: BAE Systems, DARPA MTO, ARL MSME CRA.

With contributions from Dr. D. D’Orsogna, Dr. C.A. Keasler, Dr. M. Moresco, Mr. J. Schuster, Mr. B. Pinkie

Distribution Statement “A” (Approved for Public Release, Distribution Unlimited). The views expressed are those of the author and do not reflect the official policy or position of the Department of Defense or the U.S. Government.

Speaker Biography

Professional Preparation

  • Politecnico di Milano, Italy, Ingegneria Elettronica Laurea, 1989
  • Georgia Institute of Technology, Electrical Engineering PhD, 1999

Awards and Honors

  • 2003 ONR Young Investigator Award
  • 2005 NSF CAREER Award

Research Interests

  • Computational electronics
  • Semiconductor materials and device simulations
  • Power electronics
  • Parallel computing