The optical absorption of thin-film thermal infrared detectors was calculated as a function of wavelength, pixel size, and area fill factor by use of the finite-difference time-domain (FDTD) method. The results indicate that smaller pixels absorb a significantly higher percentage of incident energy than larger pixels with the same fill factor. A polynomial approximation to the FDTD results was derived for use in system models.
© 2001 Optical Society of America
M. Mirotznik, W. A. Beck, D. Prather, R. Vollmerhausen, and R. Driggers, "Optical absorption modeling of thermal infrared detectors by use of the finite-difference time-domain method," Opt. Lett. 26, 280-282 (2001)