Evaluation of an InSb infrared detector at liquid N<sub>2</sub> and liquid He temperatures

Y.-X. Zhang; F. O. Williamson

doi:10.1364/AO.21.002036

Applied Optics
Vol. 21,
Issue 11,
pp. 2036-2040
(1982)
•https://doi.org/10.1364/AO.21.002036

Evaluation of an InSb infrared detector at liquid N₂ and liquid He temperatures

Y.-X. Zhang and F. O. Williamson

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Y.-X. Zhang and F. O. Williamson, "Evaluation of an InSb infrared detector at liquid N₂ and liquid He temperatures," Appl. Opt. 21, 2036-2040 (1982)

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Abstract

The performance of an InSb infrared detector has been evaluated at liquid nitrogen and liquid helium cryogenic temperatures. A significant improvement in sensitivity was observed when the detection system was Johnson noise limited. With 300-K background radiation and diffraction limited throughout, the NEP of the detector is 1.5 × 10⁻¹⁶ W Hz^−1/2 at 1.65 μm. Potential improvement is expected especially for astrophysical observations which are made in lower photon background conditions.

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T_(K)	R_f1 (Ω)	R_f2 (Ω)	R_d (Ω)
300	2.4 × 10¹⁰	0.9 × 10⁸	—
66	3.4 × 10¹⁰	1.1 × 10⁸	1.7 × 10¹⁰
4	5.0 × 10¹⁰	5.6 × 10⁸	>5.0 × 10¹⁰

T (K)	S_Rf1/S_Rf2	R_f1/R_f2	(1 + 2πfC_fR_f1)^−1/2
66	212	309	0.69
4	46	89.3	0.52

Conditions of the measurements		R_f1 = 3.4 × 10¹⁰ Ω, 66 K		R_f1 = 5.0 × 10¹⁰ Ω, 4 K		R_2f = 1.1 × 10⁸ Ω, 66 K		R_2f = 5.6 × 10⁸ Ω, 44 K

λ μm	Δλ μm	V_n μV Hz^−1/2	NEP W Hz^−1/2	V_n μV Hz^−1/2	NEP W Hz^−1/2	V_n μV Hz^−1/2	NEP W Hz^−1/2	V_n μV Hz^−1/2	NEP W Hz^−1/2
1.28	0.146	12.1	5.75 × 10⁻¹⁶	5.0	1.61 × 10⁻¹⁶			0.34	9.80 × 10⁻¹⁶
1.65	0.297	14.1	5.19 × 10⁻¹⁶	6.0	1.50 × 10⁻¹⁶	0.58	6.60 × 10⁻¹⁵	0.36	8.05 × 10⁻¹⁶
2.34	0.50	19.5	5.06 × 10⁻¹⁶	18.3	3.23 × 10⁻¹⁶	0.50	4.01 × 10⁻¹⁵	0.42	6.62 × 10⁻¹⁶
3.08	0.11	48.7	9.61 × 10⁻¹⁶	48.8	6.55 × 10⁻¹⁶	0.58	3.54 × 10⁻¹⁵	0.66	7.91 × 10⁻¹⁶
3.349	0.161	73.1	1.33 × 10⁻¹⁵	79.3	9.79 × 10⁻¹⁶	0.61	3.42 × 10⁻¹⁵	1.3	1.43 × 10⁻¹⁵
3.62	0.79					1.42	7.37 × 10⁻¹⁵	4.04	4.12 × 10⁻¹⁵
3.70	0.97					1.62	8.23 × 10⁻¹⁵	5.5	5.49 × 10⁻¹⁵
3.79	0.59					1.52	7.53 × 10⁻¹⁵	5.1	4.97 × 10⁻¹⁵
4.79	0.482					2.43	9.53 × 10⁻¹⁵	8.1	6.24 × 10⁻¹⁵
4.83	0.5					2.43	9.45 × 10⁻¹⁵	6.07	4.64 × 10⁻¹⁵
Unit		V Hz^−1/2	W Hz^−1/2	V Hz^−1/2	W Hz^−1/2	V Hz^−1/2	W Hz^−1/2	V Hz^−1/2	W Hz^−1/2

T_(K)	R_f1 (Ω)	R_f2 (Ω)	R_d (Ω)
300	2.4 × 10¹⁰	0.9 × 10⁸	—
66	3.4 × 10¹⁰	1.1 × 10⁸	1.7 × 10¹⁰
4	5.0 × 10¹⁰	5.6 × 10⁸	>5.0 × 10¹⁰

T (K)	S_Rf1/S_Rf2	R_f1/R_f2	(1 + 2πfC_fR_f1)^−1/2
66	212	309	0.69
4	46	89.3	0.52

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Applied Optics