Complex refractive-index spectrum of liquid crystal in the infrared

Mitsunori Saito; Teruyuki Yasuda

doi:10.1364/AO.42.002366

Applied Optics
Vol. 42,
Issue 13,
pp. 2366-2371
(2003)
•https://doi.org/10.1364/AO.42.002366

Complex refractive-index spectrum of liquid crystal in the infrared

Mitsunori Saito and Teruyuki Yasuda

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Mitsunori Saito and Teruyuki Yasuda, "Complex refractive-index spectrum of liquid crystal in the infrared," Appl. Opt. 42, 2366-2371 (2003)

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Abstract

The ordinary and extraordinary complex refractive indices, n _o - jκ _o and n _e - jκ _e, of a nematic liquid crystal were measured in the infrared region at 3.0–11.5-µm wavelength. The complex refractive indices were evaluated in terms of the angular dependence of the reflectance. Semicylindrical CsI prisms and a goniometer were used for measurement of the reflectance in a wide incident-angle range and throughout the wide infrared spectral region. Refractive indices n _o and n _e changed notably near the absorption wavelength. Negative birefringence, i.e., n _e < n _o, was observed in the vicinity of 6.6 µm, where n _e changed more than did n _o.

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Wavelength (µm)	n _o	n _e	κ_o	κ_e	Wavelength (µm)	n _o	n _e	κ_o	κ_e	Wavelength (µm)	n _o	n _e	κ_o	κ_e
3.00	1.457	1.549	0.023	0.020	6.00	1.458	1.531	0.036	0.035	9.00	1.500	1.632	0.081	0.069
3.10	1.453	1.545	0.021	0.020	6.10	1.445	1.519	0.039	0.031	9.10	1.495	1.612	0.044	0.051
3.20	1.450	1.543	0.019	0.018	6.20	1.463	1.577	0.054	0.058	9.20	1.489	1.583	0.035	0.053
3.30	1.446	1.543	0.020	0.019	6.30	1.454	1.557	0.045	0.040	9.30	1.477	1.570	0.034	0.042
3.40	1.416	1.544	0.075	0.033	6.40	1.477	1.549	0.046	0.035	9.40	1.491	1.590	0.034	0.072
3.50	1.492	1.580	0.049	0.032	6.50	1.454	1.512	0.034	0.034	9.50	1.489	1.595	0.034	0.049
3.60	1.492	1.577	0.020	0.008	6.60	1.463	1.456	0.058	0.116	9.60	1.491	1.606	0.034	0.038
3.70	1.489	1.566	0.014	0.007	6.70	1.476	1.665	0.046	0.472	9.70	1.484	1.598	0.033	0.029
3.80	1.482	1.564	0.014	0.007	6.80	1.439	1.572	0.048	0.046	9.80	1.477	1.583	0.034	0.037
3.90	1.476	1.564	0.014	0.007	6.90	1.464	1.579	0.080	0.055	9.90	1.482	1.607	0.034	0.038
4.00	1.475	1.564	0.014	0.007	7.00	1.501	1.581	0.055	0.034	10.00	1.475	1.592	0.028	0.021
4.10	1.475	1.564	0.012	0.005	7.10	1.497	1.573	0.031	0.024	10.10	1.475	1.586	0.031	0.023
4.20	1.475	1.564	0.011	0.005	7.20	1.481	1.560	0.053	0.053	10.20	1.477	1.586	0.034	0.035
4.30	1.476	1.564	0.011	0.003	7.30	1.478	1.605	0.058	0.110	10.30	1.475	1.593	0.034	0.027
4.40	1.476	1.564	0.008	0.001	7.40	1.469	1.537	0.031	0.042	10.40	1.475	1.586	0.032	0.025
4.50	1.480	1.581	0.010	0.005	7.50	1.467	1.541	0.028	0.035	10.50	1.475	1.581	0.034	0.034
4.60	1.476	1.565	0.006	0.001	7.60	1.462	1.536	0.030	0.050	10.60	1.491	1.594	0.034	0.044
4.70	1.476	1.564	0.006	0.001	7.70	1.459	1.525	0.039	0.070	10.70	1.491	1.609	0.034	0.027
4.80	1.476	1.564	0.006	0.001	7.80	1.468	1.543	0.043	0.068	10.80	1.477	1.596	0.033	0.019
4.90	1.476	1.564	0.006	0.001	7.90	1.474	1.540	0.041	0.066	10.90	1.475	1.590	0.032	0.019
5.00	1.476	1.564	0.006	0.001	8.00	1.487	1.542	0.084	0.120	11.00	1.469	1.585	0.032	0.019
5.10	1.476	1.554	0.006	0.001	8.10	1.478	1.637	0.067	0.163	11.10	1.466	1.584	0.029	0.020
5.20	1.476	1.554	0.006	0.001	8.20	1.461	1.681	0.060	0.387	11.20	1.474	1.585	0.029	0.021
5.30	1.476	1.553	0.006	0.001	8.30	1.481	1.599	0.060	0.182	11.30	1.471	1.589	0.039	0.031
5.40	1.476	1.552	0.006	0.001	8.40	1.489	1.623	0.051	0.110	11.40	1.473	1.586	0.046	0.035
5.50	1.465	1.551	0.006	0.001	8.50	1.482	1.616	0.038	0.079	11.50	1.480	1.586	0.050	0.028
5.60	1.464	1.540	0.012	0.010	8.60	1.485	1.643	0.050	0.100
5.70	1.450	1.533	0.042	0.020	8.70	1.483	1.608	0.031	0.055
5.80	1.485	1.553	0.213	0.185	8.80	1.478	1.590	0.035	0.046
5.90	1.461	1.529	0.032	0.037	8.90	1.478	1.620	0.078	0.078

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Applied Optics