Fano resonance in all-dielectric binary nanodisk array realizing optical filter with efficient linewidth tuning

Abstract

In this research paper, we study the Fano resonance originating from the interaction of in-phased lattice collective resonance and anti-phased lattice collective resonance supported by a binary silicon nanodisk array. Experimental results agree well with the calculations using finite-difference-time-domain method and show a strong dependence of such Fano lineshapes on the radius difference of the particles in the array. Further calculations demonstrate that such binary silicon nanodisk array can be used as an optical filter and offers an efficient way to tune the linewidth simply by changing the radius of the particles, linewidth from 12 nm to 0.7 nm and corresponding Q factor from 72 to 1290 as the radius R(2) increasing from 60 nm to 115 nm. Such scheme possessing the merits of being easily fabricated, simulated, and tuned is very promising for practical applications.

Directional Fano Resonance in an Individual GaAs Nanospheroid

“…Fano resonance, a type of resonant scattering phenomenon which results in an asymmetric line‐shape, has been widely studied in the half past century . It promises applicability in a number of photonic devices, such as optical switches, filters, sensors, and so on. To date, Fano resonance has been achieved by various nanostructures like photonic crystals, plasmonic materials, and metamaterials .…”

Broken Symmetry Dielectric Resonators for High Quality Factor Fano Metasurfaces

“…This approach has been demonstrated for metal-based metasurfaces at THz frequencies where Q-factors approaching 100 have been observed [11,12]. Even more dramatic results have been achieved by applying this strategy to dielectric resonator-based metasurfaces and Q-factors approaching 500 have been demonstrated [14].A common feature of the dielectric resonator-based Fano designs demonstrated thus far is the reliance on multiple, distinct, near-field coupled dielectric structures within the unit cell [14][15][16]. However, reliable and repeatable control of near-field coupling requires exacting fabrication tolerances and it is of interest to inquire if simpler high-Q Fano designs can be developed.…”

“…Dielectric resonator-based metasurfaces were introduced to overcome these losses and have enabled, among others, wave-front manipulation and cloaking devices, perfect reflectors, and ultrathin lenses [1-10] but, although absorptive losses were reduced, the metasurface resonances remained broad due to strong coupling with the external field (i.e. large radiation losses).Recently, new strategies based on "electromagnetically induced transparency" or "Fano resonances" have been developed that show great promise for achieving high-Q resonances [11][12][13][14][15]. In this approach, the resonator system is designed to support both "bright" and "dark" resonances.…”

“…Recently, new strategies based on "electromagnetically induced transparency" or "Fano resonances" have been developed that show great promise for achieving high-Q resonances [11][12][13][14][15]. In this approach, the resonator system is designed to support both "bright" and "dark" resonances.…”

Numerical Investigation on Multiple Resonant Modes of Double-Layer Plasmonic Grooves for Sensing Application

“…Since the discovery of extraordinary optical transmission through subwavelength aperture arrays on opaque metal films [1], the design of metal nanostructures and analysis of involved physical mechanisms have attracted enormous attention, and these studies have tremendously contributed to the development of surface plasmonic nanophotonics [2][3][4][5][6]. In the past few years, many applications on the basis of surface plasmon nanostructures have been proposed, such as sensors, superlens imaging [7][8][9], negative refractive effects [10][11][12], color filters [13][14][15][16][17], perfect absorbers [18][19][20] and the like. Surface plasmon sensors have developed into an advanced detection method because of their high sensitivity, wide detection range and easy miniaturization.…”