Extended wavelength infrared photodetectors

Dilip Chauhan; A. G. Unil Perera; Lianhe Li; Li Chen; Suraj P. Khanna; Edmund H. Linfield

doi:10.1117/1.OE.56.9.091605

7 February 2017 Extended wavelength infrared photodetectors

Dilip Chauhan, A. G. Unil Perera, Lianhe Li, Li Chen, Suraj P. Khanna, Edmund H. Linfield

Author Affiliations +

Optical Engineering, Vol. 56, Issue 9, 091605 (February 2017). https://doi.org/10.1117/1.OE.56.9.091605

Abstract

Extension of the wavelength threshold of an infrared detector beyond λt=hc/Δ is demonstrated, without reducing the minimum energy gap (Δ) of the material. Specifically, a photodetector designed with Δ=0.40 eV, and a corresponding λt=3.1 μm, was shown to have an extended threshold of ∼45 μm at 5.3 K, at zero bias. Under negative and positive applied bias, this range was further extended to ∼60 and ∼68 μm, respectively, with the photoresponse becoming stronger at increased biases, but the spectral threshold remained relatively constant. The observed wavelength extension arises from an offset between the two potential barriers in the device. Without the offset, another detector with Δ=0.30 eV showed a photoresponse with the expected wavelength threshold of ∼4 μm.

Citation Download Citation

Dilip Chauhan, A. G. Unil Perera, Lianhe Li, Li Chen, Suraj P. Khanna, and Edmund H. Linfield "Extended wavelength infrared photodetectors," Optical Engineering 56(9), 091605 (7 February 2017). https://doi.org/10.1117/1.OE.56.9.091605

Received: 16 December 2016; Accepted: 25 January 2017; Published: 7 February 2017

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