Guided Mode Resonance in a Low-Index Waveguide Layer

Abstract

In this paper, we show that the guided mode resonance can exist in a low-index waveguide layer on top of a high-index substrate. With the help of the interaction of diffraction from a metal grating and total internal reflection effects, we verify that the guided mode can be supported in the low-index SU8 layer on a high-index substrate. Simulation and experiment show the resonant wavelength can be simply manipulated by controlling the geometrical parameters of the metal grating and waveguide layer. This structure extends the possibilities of guided-mode resonance to a broader class of functional materials and may boost its use in applications such as field enhancement, sensing and display.

Numerical Analysis of the Light Modulation by the Frustule of Gomphonema parvulum: The Role of Integrated Optical Components

“…For a specific range of wavelengths, the grid-like element exhibits another phenomenon, guided-mode resonance (GMR), which is widely reported for dielectric resonant gratings and photonic crystals of period d comparable to λ vacc [ 89 , 90 , 91 ]. At a specific combination of various parameters related to the incident light, including λ vacc , ϴ inc , and polarization, and the grid, including thickness D , pore spacing d , filling factor ff , and its material refractive index n , the grid-coupled GMR can be obtained [ 90 , 92 , 93 , 94 ]. It occurs when the grid (considered as an inhomogeneous waveguide) couples the incident wavefront into guided modes, which cannot be sustained within, and leak out [ 92 ] to interfere constructively or destructively with the reflectance or transmittance, respectively, leading to the characteristic spectrum of GMR [ 90 ].…”

“…Most previous studies focused on coupling GMR and surface plasmon resonances of the metallic nanoparticles or thin films to obtain efficient hybrid substrates for surface-enhanced Raman spectroscopy (SERS) [ 103 , 104 ]. In general, GMR can also be of interest for sensing applications and optoelectronic devices [ 89 , 94 , 105 ] associated with enhancing electromagnetic fields near the valve surface through the simultaneous evanescence field. Due to the GP valve’s finite size, and, thus, small grid unit number, the quality of GMR is expected to be reduced.…”

Refractive index sensing of double Fano resonance excited by nano-cube array coupled with multilayer all-dielectric film

“…First, the formation of discrete states is discussed. The diffraction condition of the grating can be expressed as [29] Pn(sin…”

Polymer-Based Guided-Mode Resonance Sensors: From Optical Theories to Sensing Applications

“…On the other hand, EpoCore GMR had both TE and TM polarizations, which were observed at 873.13 and 854.38 nm, respectively. Guo et al 82 demonstrate that the GMR effect can be produced by utilizing low refractive index polymer as the waveguide incorporated with high refractive index substrate. SU-8 (n= 1.60) is used as a low-index waveguide on top of the lithium niobate substrate (n = 2.20).…”

“…Guo et al demonstrate that the GMR effect can be produced by utilizing low refractive index polymer as the waveguide incorporated with high refractive index substrate. SU-8 ( n = 1.60) is used as a low-index waveguide on top of the lithium niobate substrate ( n = 2.20).…”