Shift happens: optical sensing with Dyakonov-Tamm waves

Akhlesh Lakhtakia; Muhammad Faryad

doi:10.1117/12.2062713

27 August 2014 Shift happens: optical sensing with Dyakonov-Tamm waves

Akhlesh Lakhtakia, Muhammad Faryad

Proceedings Volume 9172, Nanostructured Thin Films VII; 91720H (2014) https://doi.org/10.1117/12.2062713
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

Abstract

An optical modality to sense a fluid by exploiting Dyakonov-Tamm (DT) waves was devised. In the modality, the fluid is present on both sides of the guiding interface. Theory showed that the angular location of reflectance dip in a practically implementable configuration will shift if the refractive index of the fluid changes. Furthermore, the detection sensitivity will decrease as the refractive index of the fluid increases over a wide range, and should be comparable to that for sensing modalities that exploit surface-plasmon-polariton (SPP) waves. Higher sensitivities are available with DT waves than with SPP waves, and the DT-wave-based sensor should be simpler to fabricate than the SPP-wave-based sensor. Multiple DT waves are excitable at the same frequency, leading to multiple channels for more reliable sensing as well as for sensing multiple analytes simultaneously.

Citation Download Citation

Akhlesh Lakhtakia and Muhammad Faryad "Shift happens: optical sensing with Dyakonov-Tamm waves", Proc. SPIE 9172, Nanostructured Thin Films VII, 91720H (27 August 2014); https://doi.org/10.1117/12.2062713

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KEYWORDS

Interfaces

Neptunium

Refractive index

Wave propagation

Optical sensing

Prisms

Sensors

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