Chalcogenide Glass Bolometers

S. G. Bishop; W. J. Moore

doi:10.1364/AO.12.000080

Applied Optics
Vol. 12,
Issue 1,
pp. 80-83
(1973)
•https://doi.org/10.1364/AO.12.000080

Chalcogenide Glass Bolometers

S. G. Bishop and W. J. Moore

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S. G. Bishop and W. J. Moore, "Chalcogenide Glass Bolometers," Appl. Opt. 12, 80-83 (1973)

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Abstract

The chalcogenide glass Tl₂SeAs₂Te₃ has been evaluated as a thermistor bolometer material for room temperature operation. Thin film bolometers were fabricated on mica, glass, and sapphire substrates by both hot-pressing and rf sputtering techniques. Best results were achieved with 10-μ thick Tl₂SeAs₂Te₃ elements on thin mica substrates. Using a 500 K blackbody at a 10-Hz chopping frequency, a 2.5 × 10⁻³-cm² device yielded an NEP of 2.3 × 10⁻⁹ W Hz^−1/2, and a 10⁻⁴-cm² device achieved an NEP of 7.7 × 10⁻¹⁰ W Hz^−1/2. The ac performance of these devices is limited by their inherently long response times (τ ≅ 1 sec).

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Detector area (cm²)	Backing	Responsivity (V/W)	NEP (W Hz^−1/2)	D* (W⁻¹ Hz^1/2 cm)	τ (sec)
0.14	100-μ Mica	1.2	3.9 × 10⁻⁷	1 × 10⁶	5
5 × 10⁻²	10-μ Mica	10	3.4 × 10⁻⁸	6.5 × 10⁶	1.5
2.5 × 10⁻³	10-μ Mica	310	2.6 × 10⁻⁹	1.9 × 10⁷	0.7
5 × 10⁻³	Sapphire	18	6.6 × 10⁻⁸	1.1 × 10⁶	0.002

Detector area(cm²)	Backing	Responsivity (V/W)	NEP (W Hz^−1/2)	D* (W⁻¹ Hz^1/2 cm)	τ (sec)
^a1 × 10⁻²	15-μ Mica	12	1.7 × 10⁻⁸	5.8 × 10⁶	—
2.5 × 10⁻³	50-μ Glass	30	7.1 × 10⁻⁹	6.9 × 10⁶	1
2.5 × 10⁻³	15-μ Mica	54	4.2 × 10⁻⁹	−1.2 × 10⁷	2
^a2.5 × 10⁻³	15-μ Mica	98	2.3 × 10⁻⁹	2.2 × 10⁷	2
1 × 10⁻⁴	15-μ Mica	160	1.7 × 10⁻⁹	5.8 × 10⁶	0.2
^a1 × 10⁻⁴	15-μ Mica	270	7.7 × 10⁻¹⁰	1.3 × 10⁷	0.2

Detector area (cm²)	Backing	Responsivity (V/W)	NEP (W Hz^−1/2)	D* (W⁻¹ Hz^1/2 cm)	τ (sec)
0.14	100-μ Mica	1.2	3.9 × 10⁻⁷	1 × 10⁶	5
5 × 10⁻²	10-μ Mica	10	3.4 × 10⁻⁸	6.5 × 10⁶	1.5
2.5 × 10⁻³	10-μ Mica	310	2.6 × 10⁻⁹	1.9 × 10⁷	0.7
5 × 10⁻³	Sapphire	18	6.6 × 10⁻⁸	1.1 × 10⁶	0.002

Detector area(cm²)	Backing	Responsivity (V/W)	NEP (W Hz^−1/2)	D* (W⁻¹ Hz^1/2 cm)	τ (sec)
^a1 × 10⁻²	15-μ Mica	12	1.7 × 10⁻⁸	5.8 × 10⁶	—
2.5 × 10⁻³	50-μ Glass	30	7.1 × 10⁻⁹	6.9 × 10⁶	1
2.5 × 10⁻³	15-μ Mica	54	4.2 × 10⁻⁹	−1.2 × 10⁷	2
^a2.5 × 10⁻³	15-μ Mica	98	2.3 × 10⁻⁹	2.2 × 10⁷	2
1 × 10⁻⁴	15-μ Mica	160	1.7 × 10⁻⁹	5.8 × 10⁶	0.2
^a1 × 10⁻⁴	15-μ Mica	270	7.7 × 10⁻¹⁰	1.3 × 10⁷	0.2

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Applied Optics