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The Reflectance of Laser Light from a Series of Thin Films: a Study of Optical Bistability

Victor J. Montemayor

Published Jan 1, 1986• 0 citations
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Optical bistability of partial reflection-coated thin film of oil red O

Quy Ho Quang, Luu Mai Van, Thanh Thai Doan +3 more

In this paper, a thin film of oil red O coated by partial dielectric mirrors (PRFORO) operating as an optical bistable device is proposed. The equation of the output-input intensity relation considering nonlinear absorption inside PRFORO is derived and the optical bistability (OB) of PRFORO is shown. Additionally, the influence of the nonlinear refractive, absorptive coefficients of oil red O (ORO), reflective coefficient of mirrors, and the thickness of thin film on the OB is numerically investigated and discussed. As a result, the threshold switching power is lower than 19 mW; the minimum power of output up-state is larger than 40 µW for the optimal PRFORO designed with an ORO concentration larger than 0.1 mM; the thickness of the thin film is longer than 0.1 mm; and the reflective coefficient of mirrors is lower than 93%. The proposed model is suitable for all-optical switches, optical images, and signal processing.

Applied Optics•May 19, 2020•9 citations
First reports of absorptive all-optical bistabilities in reflectance and luminescence of a Fabry-Perot cavity consisting of thin (0.70 ,cem) ZnSe film are presented. We demonstrate that the observation of bistability in the reflected beam does not require necessarily the appearance of bistability in the transmitted beam. Luminescence bistabilities, however, are observed both in the light captured Lrom the incident side 0L the film and in the light emitted from the transmission side. The bistabilities in reflection and luminescence are explained quite satisfactorily by the principle of increasing absorption due to photo-irradiation and the dependence of the luminescence intensity on a photo-thermally induced temperature change, respectively. A11 experiments were carried out at room temperature with the 488 nm line of an argon laser.
In this paper, a thin film of oil red O coated by partial dielectric mirrors (PRFORO) operating as an optical bistable device is proposed. The equation of the output-input intensity relation considering nonlinear absorption inside PRFORO is derived and the optical bistability (OB) of PRFORO is shown. Additionally, the influence of the nonlinear refractive, absorptive coefficients of oil red O (ORO), reflective coefficient of mirrors, and the thickness of thin film on the OB is numerically investigated and discussed. As a result, the threshold switching power is lower than 19 mW; the minimum power of output up-state is larger than 40 µW for the optimal PRFORO designed with an ORO concentration larger than 0.1 mM; the thickness of the thin film is longer than 0.1 mm; and the reflective coefficient of mirrors is lower than 93%. The proposed model is suitable for all-optical switches, optical images, and signal processing.