Stray light suppression in InGaAs/GaAsSb type-II FPA

Sundararajan Balasekaran; Masaki Migita; Takahiko Kawahara; Ken-ichi Machinaga; Kouhei Miura; Hiroshi Inada; Yasuhiro Iguchi; Tsukuru Katsuyama

doi:10.1117/12.2213971

13 February 2016 Stray light suppression in InGaAs/GaAsSb type-II FPA

Sundararajan Balasekaran, Masaki Migita, Takahiko Kawahara, Ken-ichi Machinaga, Kouhei Miura, Hiroshi Inada, Yasuhiro Iguchi, Tsukuru Katsuyama

Author Affiliations +

Proceedings Volume 9755, Quantum Sensing and Nano Electronics and Photonics XIII; 97551Z (2016) https://doi.org/10.1117/12.2213971
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

Stray light in focal plane array (FPA) deteriorates the accuracy of hyper spectral imaging. Multiple reflections between FPA window and peripheral region of a sensor chip are considered to be the major sources of stray light. One idea for suppressing the stray light is to shield the incident light on the peripheral region of the sensor chip by narrowing the FPA window. However, it is limited by the tolerance of assembly. In this study we have examined an epoxy coating on the peripheral region such as ROIC contact pad area, AlN substrate and bonding wire. Sensor chip with InGaAs/GaAsSb type-II quantum well structures, which has the cut-off wavelength of 2.35 μm, 320×256 pixels were bonded to ROIC through indium bumps, assembled to AlN substrate and to a four stage TEC. To avoid the degradation by the stress to the chip and bonding wire, low elastic modulus epoxy was selected. Stray light suppression was confirmed by the sensor signal output of epoxy coated samples, 3% contrast improvement was achieved. Further, reliability test of 10,000 heat cycles between -75°C and 25°C was carried out. No degradations were found in sensor characteristics of the epoxy coated sample. These results suggest that the epoxy coating in SWIR FPA is effective in suppressing the stray light and suitable for hyper spectral imaging.

Citation Download Citation

Sundararajan Balasekaran, Masaki Migita, Takahiko Kawahara, Ken-ichi Machinaga, Kouhei Miura, Hiroshi Inada, Yasuhiro Iguchi, and Tsukuru Katsuyama "Stray light suppression in InGaAs/GaAsSb type-II FPA", Proc. SPIE 9755, Quantum Sensing and Nano Electronics and Photonics XIII, 97551Z (13 February 2016); https://doi.org/10.1117/12.2213971

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available