Sharp Multiple-Phase Resonances in a Plasmonic Compound Grating With Multislits

Abstract

Transmission properties of light through a plasmonic grating with multislits are investigated. The results show that sharp phase resonance (PR) and multiphase resonance (MPR) for each mode at multiple frequencies are achieved and effectively tailored only by adjusting the slight difference of the multislit widths; the values of the PR dips are almost zero. Based on the field distributions, Fabry-Pérot-resonant and phase-resonant mechanisms have been suggested for the physical origins of the observations qualitatively. In addition, we can realize the control of light spreading through an arbitrary slit; a multichannel selector is modeled and described. Compared with the conventional plasmonic compound grating, this multislit grating with different slit widths has obvious advantages, such as simple structure, single material composition, and better realizability. PR and MPR can be achieved at multiple frequencies.

High-Performance Electro-Optic Manipulation by Plasmonic Light Absorber With Nano-Cavity Field Confinement

“…The field patterns seem to be only one part for the latter one. These characteristics confirm the excitation of the 2 th and 1 th cavity modes [52][53][54][55][56] via the nano-slit assisted metal grating structure for the resonant absorption at λ 2 and λ 3 , respectively. Based on this plasmonic cavity resonances assisted light absorber, we further investigate the artificially tunable features via using the applied voltage V a , which could lead to the influence on the EO film.…”

“…This mainly results from the cavity mode occurred at the wavelengths related to the slit's height. The sharp absorption peaks seem to be very sensitive to the height due to the higher order cavity mode with the need of the suitable height for the resonance [53,55,56]. For instance, the 2 th mode can be efficiently excited when the height is close to 50 nm or 100 nm.…”

Fabry-Pérot Huygens' metasurfaces: On homogenization of electrically thick composites

“…Then, Eqs. (33) and (34) may be used successively to determine 21 m   , 2m  for every other value of m. We will choose a base value which will lead to a solution with special properties. We know from Eqs.…”

“…When power is not conserved by the solutions 21 m   , 2m  of the inhomogeneous system {(33),(34)}, these must be supplemented by solutions 2 1 2 , mm   of the homogeneous form of Eqs. (33) and (34) (i.e. the same equations but with right-hand-side zero).…”

“…In particular, the meta-atom synthesis generally requires optimization in full-wave solvers; this is avoided herein by harnessing conducting walls to separate adjacent unit cells, which is more realistic in the microwave regime, enabling the rigorous microscopic design. Such a separation has previously been utilized in producing "extraordinary transmission" phenomena [31]- [33], and for controlling reflected modes, from the early microwave reflectarray antennas [34] to concurrent anomalous reflection acoustic metasurfaces [35], wherein the phase variation is attained by varying the parallel-plate waveguide length. For transmit-mode applications, however, a different approach, such as the one introduced here, is required, as mere variation of the waveguide length cannot effectively modulate the phase of the transmission coefficient.…”