Grating-coupled Otto configuration for hybridized surface phonon polariton excitation for local refractive index sensitivity enhancement

Suejit Pechprasarn, Supannee Learkthanakhachon, Gaige Zheng, Hong Shen, Dangyuan Lei, Michael Geoffrey Somekh

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)


� 2016 Optical Society of America. We demonstrate numerically through rigorous coupled wave analysis (RCWA) that replacing the prism in the Otto configuration with gratings enables us to excite and control different modes and field patterns of surface phonon polaritons (SPhPs) through the incident wavelength and height of the Otto spacing layer. This modified Otto configuration provides us the following multiple modes, namely, SPhP mode, Fabry-P�rot (FP) cavity resonance, dielectric waveguide grating resonance (DWGR) and hybridized between different combinations of the above mentioned modes. We show that this modified grating-coupled Otto configuration has a highly confined field pattern within the structure, making it more sensitive to local refractive index changes on the SiC surface. The hybridized surface phonon polariton modes also provide a stronger field enhancement compared to conventional pure mode excitation.
Original languageEnglish
Pages (from-to)19517-19530
Number of pages14
JournalOptics Express
Issue number17
Publication statusPublished - 22 Aug 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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