Low sideband guided-mode resonant filter

Abstract

A guided-mode resonant filter with low sideband reflections is proposed. It is shown that, for serious reduction of out-of band reflectance, the combination of waveguide-grating filter design with conventional antireflective stack design methods is not adequate. To achieve symmetrical low sideband reflectances, independent control of various layer thicknesses is necessary. At a given illumination angle with appropriate control of the waveguide thickness, a specific resonant grating filter is designed whose out-of-band reflectance on both sides of the resonant peak is well below 10(-4). Even 50 nm away from the peak, on both sides, the out-of-band reflectance remains below 10(-3). Analysis of the variation in the main manufacturing parameters indicates that such filters can be reliably produced with present-day technologies.

A highly-compliant asymmetric 2D guided-mode resonance sensor for simultaneous measurement of dual-axis strain

“…Guided-mode resonance gratings, also known as leaky-mode resonance gratings or photonic crystal surfaces, have been particularly widely researched both for telecommunications applications [1,2] and as a method of label-free biodetection [3][4][5][6][7]. More recently, compliant polymer-based GMR devices has been demonstrated with applications in mechanical strain sensing [8,9], although thus far these devices have been limited to detection of strain in one dimension only Strain sensors have a large number of practical applications, from the research and development of new materials and systems, to structural health monitoring of existing ones.…”

Cavity-resonator-integrated guided-mode resonance filter with several grating lines in aperture

“…A guided-mode resonance filter (GMRF) consisting of a surface-relief grating and a thin-film waveguide is an attractive device as a wavelength filter and a laser mirror because of its narrow-band reflection spectrum for a free-space incident beam and simple structure suitable for mass production [1][2][3][4][5]. The surface-relief grating acts as a grating coupler (GC) that excites and out-couples guided waves at an operation wavelength.…”

Cavity-resonator-integrated guided-mode resonance filter in channel waveguide

“…A guided-mode resonance filter (GMRF) consisting of a surface grating in a thin-film waveguide shows a narrow-band reflection spectrum for an incident wave from free space [1,2,3,4,5,6,7], where the grating acts as a grating coupler (GC) that excites and out-couples a guided wave at a coupling wavelength, namely, a resonance wavelength. GMRF can be fabricated by a-few-layer deposition followed by surface patterning and give an advantage of high fabrication-throughput in comparison with multilayer dielectric mirrors (MDM).…”