Title

Copper Doped Gaas Infrared Filter For The 8-13 Μm Atmospheric Window

Keywords

Copper; Filter; Gaas; Infrared

Abstract

High temperature diffusion of Cu into GaAs was used to prepare infrared filters for the 8 - 13 μm atmospheric transmission window. Copper was evaporated to thickness ∼ 100 nm on both sides of double-side polished 1.7 mm thick GaAs samples, then sealed in evacuated quartz ampoules back filled with 250 torr of helium. The ampoules were heated at temperatures between 600 C and 1200 C for periods of 15 min to 16 hours, and then quenched in water. Infrared spectra were collected using a Fourier spectrometer at 1.7 K - 20 K sample temperature, 500 to 3500 cm -1 spectral range, and 1 cm -1 resolution. The well known Cu:GaAs sharp-line absorption spectrum was observed near 1200 cm -1 together with a strong photo-ionization band at higher wave numbers. The latter provides zero transmission for wavelengths shorter than 8 μn. The sharp cut-off shifts to longer wavelengths as diffusion times and temperature increase. This process allows for the simple preparation of infrared long pass filters. The concentration profile was modeled to better understand the relation between Cu concentration and spectrum.

Publication Date

12-20-2004

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

5406

Issue

PART 2

Number of Pages

872-878

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.542210

Socpus ID

10044296212 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/10044296212

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