Materials, Photonic Devices, and Sensors

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

[+] Author Affiliations
Farhat Abbas

Quaid-i-Azam University, Department of Electronics, Islamabad 45320, Pakistan

Lahore University of Management Sciences, Department of Physics, Lahore 54792, Pakistan

Qaisar A. Naqvi

Quaid-i-Azam University, Department of Electronics, Islamabad 45320, Pakistan

Muhammad Faryad

Lahore University of Management Sciences, Department of Physics, Lahore 54792, Pakistan

Opt. Eng. 54(6), 067109 (Jun 23, 2015). doi:10.1117/1.OE.54.6.067109
History: Received February 13, 2015; Accepted May 28, 2015
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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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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Farhat Abbas ; Qaisar A. Naqvi and Muhammad Faryad
"Dyakonov–Tamm waves-based optical sensing using sculptured nematic thin film", Opt. Eng. 54(6), 067109 (Jun 23, 2015). ; http://dx.doi.org/10.1117/1.OE.54.6.067109


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