The light filtering and guiding properties of high finesse phase resonant compound gratings

Abstract

Phase resonances in compound gratings are studied in the frequency and time domains, with the gratings having two dissimilar grooves within the unit cell that each support waveguide cavity modes that couple. Described in this work are the dependence of the phase resonances' Q on the degree of difference between the grooves in the unit cell, their optical properties, a closed-form expression describing their dispersion, their excitation, and the extraction of energy from the phase resonances into free space and into a waveguide. Application to optical filters and corrugated surface antennas are discussed.

Striking properties of light transmitted by a double period nanoslit structure under evanescent incidence

“…These minima are associated with phase resonances, i.e., resonances that arise due to the particular distribution of the magnetic field phase within the slits and they can be clearly identified as thin vertical bands in figure 2. This kind of resonances has been extensively studied in dual period structures of different types under propagating incidence [8][9][10][11][12][13][14]. However, to the best of our knowledge, the evanescent incidence case has not been explored yet.…”

“…It is well known that the electromagnetic response of regular metallic wire gratings is marked by several mechanisms such as surface plasmon excitation [1,2], Wood and Rayleigh anomalies [3], Fabry-Perot (FP) resonances [4] and grating resonances [5][6][7]. In addition to these mechanisms, dual-period structures allow the excitation of phase resonances [8][9][10][11][12][13][14] and are also capable of enhancing or cancelling out the efficiency of a particular diffracted order [15][16][17][18]. Not only numerical and experimental results have proved the existence of such anomalies, but also a variety of simplified models have been successfully proposed to provide physical insight into the underlying physics involved [19][20][21][22][23].…”

Nearly perfect absorption in a single-layer metallic grating with rectangular grooves on its front surface

“…It is well known that metallic gratings, especially the compound metallic grating are rich in all kinds of resonances which include the horizontal surface plasmons (HSPs) [10,11], cavity modes (CMs) [10,11], Wood-Rayleigh (WR) anomalies [12], phase resonance (PR) [13,14] and various coupled resonant modes between them. These resonances make it possible to manipulate the light in near field, such as enhanced or inhibited transmission [11,15], photon sorting [16,17], light trapping [18], light concentration and enhanced absorption [17,18].…”

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].…”