Dyakonov–Tamm waves-based optical sensing using sculptured nematic thin film

Farhat Abbas; Qaisar A. Naqvi; Muhammad Faryad

doi:10.1117/1.OE.54.6.067109

23 June 2015 Dyakonov–Tamm waves-based optical sensing using sculptured nematic thin film

Farhat Abbas, Qaisar A. Naqvi, Muhammad Faryad

Author Affiliations +

Optical Engineering, Vol. 54, Issue 6, 067109 (June 2015). https://doi.org/10.1117/1.OE.54.6.067109

Abstract

Dyakonov–Tamm (DT) waves are highly sensitive to the constitutive properties of the partnering materials near the interface. DT waves are excited at the interface of two dielectric materials of which at least one is anisotropic and periodically nonhomogeneous normal to their interface. Sculptured nematic thin film (SNTF) is a good candidate for the periodically nonhomogeneous dielectric partner for optical sensing of a fluid due to its porosity. The nanoscale parameters of an uninfiltrated SNTF obtained from the inverse Bruggeman homogenization formalism were used in the forward Bruggeman homogenization formalism to determine the constitutive parameters for the infiltrated SNTF. The sensitivity of DT waves to the refractive index was analyzed for two possible sensing modalities and it was found that the sensitivity was comparable to that of the chiral sculptured thin films (STFs) made of the same material as of the SNTF. This implies that the sensing with DT waves is robust, is independent of the morphology of the partnering nonhomogeneous dielectric material and could make the sensing easier since SNTFs are easier to fabricate than the chiral STFs.

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Farhat Abbas, Qaisar A. Naqvi, and Muhammad Faryad "Dyakonov–Tamm waves-based optical sensing using sculptured nematic thin film," Optical Engineering 54(6), 067109 (23 June 2015). https://doi.org/10.1117/1.OE.54.6.067109

Published: 23 June 2015

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KEYWORDS

Dielectrics

Thin films

Interfaces

Optical sensing

Homogenization

Prisms

Refractive index

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