Abstract

The transverse magnetic (TM) polarized hybrid modes formed as a consequence of coupling between Tamm plasmon polariton (TM-TPP) mode and surface plasmon polariton (SPP) mode exhibit interesting dispersive features for realizing a highly sensitive and accurate surface plasmon resonance (SPR) sensor. We found that the TM-TPP modes, formed at the interface of distributed Bragg reflector and metal, are strongly dispersive as compared to SPP modes at optical frequencies. This causes an appreciably narrow interaction bandwidth between TM-TPP and SPP modes, which leads to highly accurate sensing. In addition, appropriate tailoring of dispersion characteristics of TM-TPP as well as SPP modes could ensure high sensitivity of a novel SPR platform. By suitably designing the $\mathrm{Au}/{\mathrm{TiO}}_2/{\mathrm{SiO}}_2$-based geometry, we propose a TM-TPP/SPP hybrid-mode sensor and achieve a sensitivity $\ge 900\mathrm{nm}/\mathrm{RIU}$ with high detection accuracy ($\ge 30{\mathrm{\mu m}}^{-1}$) for analyte refractive indices varying between 1.330 and 1.345 in 600–700 nm wavelength range. The possibility to achieve desired dispersive behavior in any spectral band makes the sensing configuration an extremely attractive candidate to design sensors depending on the availability of optical sources.

© 2014 Optical Society of America

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