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We treat subwavelength resonant metasurfaces inscribed with 1D and 2D periodic patterning. We show that local Fabry-Perot modes or Mie modes are not fundamentally needed to achieve wideband response. In fact, device embodiments with such modes being absent yield wider bands.
A guided-mode resonance (GMR) filter consists of a sub-wavelength waveguide grating on a transparent substrate to give a narrowband reflection with polarization selectivity for an incident wave from the air to a waveguide surface. The GMR is a kind of Fano resonance and its reflection spectrum shows a sharp peak. A spectral line width is determined by the coupling strength of the grating. A resonance...
We review principles and applications of nanophotonic devices based on the guided-mode resonance effect in thin periodic films. We discuss design and optimization with rigorous mathematical methods and review typical fabrication processes. Theoretical and experimental results for numerous prototype devices are provided. These include wideband reflectors, nonfocusing spatial filters, ultra-sparse reflectors...
A guided-mode resonance filter on a high reflectance substrate was studied to be an external mirror of short-cavity vertical-external-cavity surface-emitting laser. Feasibility of high reflectance with steep reflection phase spectrum is one of key issues and was demonstrated for the first time.
We review nanophotonic device technology that is based on fundamental photonic resonance effects. We present the physics behind resonance device operation, illustrate their design with rigorous methods, discuss fabrication processes, and present results of physical and spectral characterization. We indicate the application potential of this field, discuss some past device examples, and provide new...
A guided-mode resonance mirror (GMRM) is introduced as a combination of a guide-mode resonance filter (GMRF) and a high reflection substrate. GMRF consists of a waveguide grating on a transparent substrate and couples an incident free-space wave of resonance wavelength to a guided mode to show a narrow band reflection spectrum as well as large wavelength dependence of the reflection phase. The combination...
A guided-mode resonant filter is designed and fabricated to externally lock a GaN blue laser diode. The structure has polarization selectivity and angular tolerance to help optimize the output from the cavity.
We present reflectors using resonant gratings with ridges that are matched to an identical material thereby annulling local reflections, phase changes, and cavity effects. Wideband reflectors with excellent properties are realized.
We engineer the complex refractive index n+ik of sputtered amorphous silicon by rapid thermal annealing. An order-of-magnitude reduction of the extinction coefficient k is achieved.
We design and fabricate a light absorber based on one-dimensional gratings in amorphous Si. We obtain high theoretical and experimental absorption in unpolarized light over wide wavelength and angular ranges.
A simple fabrication approach of replicating nanoscale patterns with 300-nm periods on thermoplastic polymethyl methacrylate substrates using thermal nano-imprint lithography is reported. The resonant structures hold potential application in light trapping for thin-film solar cells.
We present experimental evidence of the rapid exchange of diffracted power between the reflected zero-order wave and a substrate wave across a small angular range. This effect enables resonant devices we call Rayleigh reflectors.
We propose an analytic theory of resonances in metallic nanoslit arrays. This is a minimal formulation of the essential physics involved in the resonance interactions of surface plasmon-polaritons and cavity modes.
A mid-infrared guided-mode resonance based reflector was designed, fabricated and tested for applications at 2.94µm. The proposed polarization insensitive devices were fabricated using a quartz/hafnium dioxide system.
Guided-mode resonance sensors employing modal-polarization diversity are presented. In an application example, we quantify the variations in the refractive index of an attaching biolayer and show that the background is stable.
Design, fabrication, and characterization of guided-mode resonance polarizers with single dielectric layer are presented. These Si3N4 and TiO2 polarizers show high transmittance for TM and low transmittance for TE polarization at λc = 1550 nm.
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