PSF and non-uniformity in a monolithic fully depleted 4T CMOS image sensor

J. Ivory; K. D. Stefanov; P. Turner; A. D. Holland

doi:10.1117/12.2313485

12 July 2018 PSF and non-uniformity in a monolithic fully depleted 4T CMOS image sensor

J. Ivory, K. D. Stefanov, P. Turner, A. D. Holland

Proceedings Volume 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII; 1070928 (2018) https://doi.org/10.1117/12.2313485
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

Lateral charge diffusion is one of the main contributors to the Point Spread Function (PSF) in CMOS image sensors, due to the small depth to which they can be depleted. This can have an adverse effect on the spatial resolution of the sensor and the measured shape of the observed object. In this paper, PSF measurements are made on a novel CMOS detector capable of reverse bias and full depletion. The PSF is measured with the Virtual Knife Edge (VKE) technique at five wavelengths, from 470 nm to 940 nm, to ascertain wavelength dependence. The inter- and intra-pixel non-uniformity is examined to determine the difference between pixels as well as within the pixels themselves. Finally, the pixel structure is also evaluated using a 1 µm spot of light to examine the effect of the internal layout of a pixel on the sensitivity to light. These factors all impact precision astronomical measurements and so need to be understood before use in science missions.

Citation Download Citation

J. Ivory, K. D. Stefanov, P. Turner, and A. D. Holland "PSF and non-uniformity in a monolithic fully depleted 4T CMOS image sensor", Proc. SPIE 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII, 1070928 (12 July 2018); https://doi.org/10.1117/12.2313485

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