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A numerical study of broadband absorbers for visible to infrared detectors

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2 Author(s)
Keasler, C.A. ; ECE Department, Boston University, 8 Saint Mary’s Street, Boston, Massachusetts 02215, USA ; Bellotti, E.

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We have studied the electromagnetic response of micro-structured surfaces realized with pillar arrays intended to provide a broadband (0.5–5.0 μm) absorption enhancement for HgCdTe photovoltaic detector arrays. We have considered both square and hexagonal lattice pillar configurations. Using a finite-difference time-domain approach we have found that the absorption enhancement is weakly dependent on the pillar lattice type, but the lattice period does have a significant impact on the enhancement. The use of these micro-structured surfaces makes it possible to eliminate the need for anti-reflection coatings on the detector back-side while maintaining negligible reflectance over a broad spectral band.

Published in:

Applied Physics Letters  (Volume:99 ,  Issue: 9 )