Abstract
Ultra narrow-band absorbing surfaces answer a growing demand of precise control of absorption spectra. Starting from a design of guided mode resonator (GMR), we present here a versatile architecture presenting resonances of very high quality factors (up to 10 000) and spectrally adjustable. This design uses multiple slices of dielectrics to focus resonating field in the middle of a metallic waveguide, diminishing its extension in the metal and thus the loss rate of the propagating mode.
Highlights
Controlling the absorption spectrum of a surface - and its thermal emission as a consequence of Kirchhoff’s law is crucial for a wide panel of applications ranging from filtering elements to light sources and thermal management
On the contrary narrowband absorbers are promising for gas sensing applications [10, 11] or as field enhancing structures since subwavelength narrow-band absorption is often synchronous with very high field concentration [12]
Considering architectures with metal-dielectric waveguides, the narrowness, and the quality factor of the resonance, depends a lot on the propagation range of the guided mode and on its losses which are mainly subordinated to mode’s penetration in the metallic components. Starting from this observation, this paper presents a multi-dielectric architecture of a guided-mode resonators (GMR) in which it is possible to control the
Summary
Controlling the absorption spectrum of a surface - and its thermal emission as a consequence of Kirchhoff’s law is crucial for a wide panel of applications ranging from filtering elements to light sources and thermal management. Metamaterials and more generally nanostructures offer the possibility of controlling the electromagnetic response of an effective medium by taking advantage of photonic and plasmonic responses of a sub-wavelength structuring of matter [1,2,3] Since it has been shown such architectures were able to tune the impedance of a surface and adapt it to free space [4], using metamaterials to tailor spectral and angular absorption met a growing interest and numerous designs were proposed depending on the desired application [5]. Considering architectures with metal-dielectric waveguides, the narrowness, and the quality factor of the resonance, depends a lot on the propagation range of the guided mode and on its losses which are mainly subordinated to mode’s penetration in the metallic components Starting from this observation, this paper presents a multi-dielectric architecture of a GMR in which it is possible to control the
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