Extraordinary light circulation and concentration of s- and p-polarized phase resonances

Abstract

Both s-polarized and p-polarized phase resonances in one-dimensionally compound transmission gratings are analyzed, modeled, and measured. We demonstrate that s-polarized phase resonances occur with similar characteristics of p-polarized phase resonances, with narrow bandwidths, high Q values, and highly amplified fields. The phase difference of π radian between the fields in the coupled cavities produces light circulation and an inversion of the transmissivity/opacity of the structure. The dependencies of bandwidth and wavelength of the resonances on structural and material properties are described, as well as the way light flows in the structure when the phase resonances are excited.

Fano phase resonances in multilayer metal-dielectric compound gratings

“…theoretically showed that PRs in low loss 2-groove CTGs can provide arbitrarily high field enhancement of the incident beam (limited only by the optical loss in the materials and fabrication tolerances) and electromagnetic filtering and channeling capabilities that may be useful for corrugated surface antennas. Also, the reader is referred to [18] that describes the design, fabrication and characterization of two single layer grating structures that support either s or p-polarized PRs; the experimental results matched the numerically modeled results as well as the predictions of the analytical model developed in [20].…”

“…There also is a Rayleigh anomaly due to the onset of far-field diffraction modes at 15 GHz. Also, there is a PR at 9.955 GHz exhibiting all the typical features of PRs (e.g., Fano resonance type of lineshape, flipping of the transmittivity/opacity, and light circulation) that have been extensively discussed in past works [18,20,21].…”

“…Multilayer metal-dielectric gratings and hole arrays have also been shown to produce numerous interesting optical effects, including EOT, negative index of refraction, and slow and fast light modes [9,10]. Besides these optical modes, phase resonances (also called π resonances) are a type of Fano resonance that have been attracting more attention due to their unusual optical properties, including their effect of flipping the transmittivity/opacity of a film, producing light circulating modes, trapping and stopping light, producing negative dispersion and negative index of refraction, and electromagnetically induced transparency [8,[11][12][13][14][15][16][17][18]. To date however, phase resonances have only been studied in single layer grating structures and not in multi-layer gratings, yet such modes should occur in multi-layer gratings in greater number and variety, and show a richer set of electromagnetic behavior.…”

Spectral light separator based on deep-subwavelength resonant apertures in a metallic film

“…This phenomenon is reminiscent of previously reported observations of negative power flow in periodic arrays of compound apertures. 23 However, our work here differs in that we consider aperiodic structures.…”

Light harvesting with metasurfaces: applications to sensors and energy generation

“…Composite engineered surfaces of various forms have been researched for years in many different technology fields (e.g., microwave, RF, optical) for applications that include electromagnetic (EM) radiation filtering to determine the polarization state and/or wavelength of an incident beam, or to perform beam steering, light harvesting, and light concentrating [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. This field has received increased attention recently because of the development of surface structures, composed of optically resonant metal structures (i.e., antennas) that operate in the infrared and visible spectral regions [20].…”