Spectral and angular characteristics of dielectric resonator metasurface at optical frequencies

Longfang Zou, Martin Lopez Garcia, W. Withayachumnankul, A Shah, M. Bhaskaran, S. Sriram, Ruth Oulton, Maciej Klemm, Christophe Fumeaux

Research output: Contribution to journalArticle (Academic Journal)peer-review

19 Citations (Scopus)

Abstract

The capability of manipulating light at subwavelength scale has fostered the applications of flat metasurfaces in various fields. Compared to metallic structure, metasurfaces made of high permittivity low-loss dielectric resonators hold the promise of high efficiency by avoiding high conductive losses of metals at optical frequencies. This letter investigates the spectral and angular characteristics of a dielectric resonator metasurface composed of periodic sub-arrays of resonators with a linearly varying phase response. The far-field response of the metasurface can be decomposed into the response of a single grating element (sub-array) and the grating arrangement response. The analysis also reveals that coupling between resonators has a non-negligible impact on the angular response. Over a wide wavelength range, the simulated and measured angular characteristics of the metasurface provide a definite illustration of how different grating diffraction orders can be selectively suppressed or enhanced through antenna sub-array design.
Original languageEnglish
JournalApplied Physics Letters
Volume105
Issue number19
DOIs
Publication statusPublished - 12 Nov 2014

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