Interaction of two guided-mode resonances in an all-dielectric photonic crystal for uniform SERS | Zendy

Laaya Sabri | Zendy; Mahmoud Shahabadi | Zendy; Keyvan Forooraghi | Zendy; Mohsen GhaffariMiab | Zendy

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Interaction of two guided-mode resonances in an all-dielectric photonic crystal for uniform SERS

Author(s) -

Laaya Sabri,

Mahmoud Shahabadi,

Keyvan Forooraghi,

Mohsen GhaffariMiab

Publication year - 2020

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.389524

Subject(s) - photonic crystal , dielectric , raman scattering , materials science , optics , guided mode resonance , optoelectronics , resonance (particle physics) , raman spectroscopy , field (mathematics) , photonics , physics , diffraction grating , mathematics , grating , particle physics , pure mathematics

For sensing and imaging applications of surface-enhanced Raman scattering (SERS), one needs a substrate with the capability of generating a consistent and uniform response and increased signal enhancement. To this goal, we propose a photonic-crystal (PC) structure capable of supporting large field enhancement due to its high quality-factor resonance. Moreover, we demonstrate that the interaction of two modes of this all-dielectric PC can provide an almost uniform field enhancement across the unit cell of the PC. This is of practical importance for SERS applications. The designed structure can support a maximum field enhancement of 70 and 97 percent of uniformity.

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