Total transmission of anomalous blue VO<sub>2</sub> thin films

Francine C. Case

doi:10.1364/AO.27.001803

Applied Optics
Vol. 27,
Issue 9,
pp. 1803-1806
(1988)
•https://doi.org/10.1364/AO.27.001803

Total transmission of anomalous blue VO₂ thin films

Francine C. Case

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Francine C. Case, "Total transmission of anomalous blue VO₂ thin films," Appl. Opt. 27, 1803-1806 (1988)

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Abstract

Scattered and total transmittance in the 360–870 nm wavelength range is compared for standard bronze and anomalous blue VO₂ thin films. Optical measurements using an integrating sphere were made on five samples which include one standard bronze VO₂ thin film and four anomalous VO₂ films prepared by different techniques. The microstructures of these films are compared and optical constants are computed at 0.632, 0.694, 1.15, and 3.4 μm.

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Sample		25°C	100°C
1	(Standard bronze)	Bronze	Bronze
2	(Two-step blue)	Blue/purple	Red
3	(Two-step blue)	Blue	Red
4	(One-step blue)	Pale blue	Pale pink
5	(One-step Blue)	Blue/purple	Red

SAMPLE	STANDARD EXIT		APERTURED EXIT (4 mm)

	24°C	100°C	24°C	100°C

GROUND GLASS	70.5	–	93.7	–
NO. 1 (STANDARD)	4.4	5.0	6.6	6.9
NO. 2 (2-STEP)	64.0	20.7	70.8	26.1
NO. 3 (2-STEP)	93.3	72.3	93.3	–
NO. 4 (1-STEP)	40.8	39.5	40.2	39.7
NO. 5 (1-STEP)	49.5	18.2	50.8	–
NO SAMPLE	0.0	0.1	1.0	1.2

SAMPLE	TEMPERATURE	λ = 0.632 μm		λ = 0.694 μm		λ = 1.15 μm		λ = 3.4 μm

		n	k	n	k	n	k	n	k
NO. 1	25°C	2.51	0.30	2.47	0.31	2.52	0.31	2.76	0.02
STANDARD BRONZE	100°C	2.45	0.35	2.00	0.37	1.72	1.59	2.40	4.40
NO. 2	25°C	1.63	0.70	1.63	0.64	1.70	0.60	2.06	0.01
2-STEP	100°C	1.59	0.43	1.56	0.34	1.27	1.01	1.63	2.24
NO. 3	25°C	1.40	0.62	1.48	0.61	1.84	0.57	2.20	0.02
2-STEP	100°C	1.35	0.48	1.30	0.39	1.02	0.91	2.00	2.35
NO. 4	25°C	1.36	0.41	1.50	0.41	1.98	0.45	1.76	0.01
1-STEP	100°C	1.35	0.30	1.34	0.25	1.08	0.54	2.48	0.38
NO. 5	25°C	1.68	0.57	1.68	0.53	2.55	0.42	1.99	0.02
1-STEP	100°C	1.55	0.38	1.69	0.33	1.04	0.90	1.98	2.10

Sample		25°C	100°C
1	(Standard bronze)	Bronze	Bronze
2	(Two-step blue)	Blue/purple	Red
3	(Two-step blue)	Blue	Red
4	(One-step blue)	Pale blue	Pale pink
5	(One-step Blue)	Blue/purple	Red

SAMPLE	STANDARD EXIT		APERTURED EXIT (4 mm)

	24°C	100°C	24°C	100°C

GROUND GLASS	70.5	–	93.7	–
NO. 1 (STANDARD)	4.4	5.0	6.6	6.9
NO. 2 (2-STEP)	64.0	20.7	70.8	26.1
NO. 3 (2-STEP)	93.3	72.3	93.3	–
NO. 4 (1-STEP)	40.8	39.5	40.2	39.7
NO. 5 (1-STEP)	49.5	18.2	50.8	–
NO SAMPLE	0.0	0.1	1.0	1.2

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Applied Optics