A Thin Electromagnetic Absorber for Wide Incidence Angles and Both Polarizations (original) (raw)

2009, Ieee Transactions on Antennas and Propagation

Indefinite dielectric response and all-angle negative refraction in a structure with deeply-subwavelength inclusions

Physical Review B, 2011

Media exhibiting negative index or negative refraction effects 1 have been the subject of study in recent years due to their extraordinary and exotic properties-rooted in the complex interactions between their basic elements and radiation-which have stimulated the imagination of the scientific community. In particular, it was predicted that metamaterials may enable subwavelength imaging 2 and the realization of novel high-resolution lenses, and may also permit partial focusing with planar lenses. For the operation of such planar ...

Selective Pyroelectric Detection of Millimetre Waves Using Ultra-Thin Metasurface Absorbers

Scientific reports, 2016

Sensing infrared radiation is done inexpensively with pyroelectric detectors that generate a temporary voltage when they are heated by the incident infrared radiation. Unfortunately the performance of these detectors deteriorates for longer wavelengths, leaving the detection of, for instance, millimetre-wave radiation to expensive approaches. We propose here a simple and effective method to enhance pyroelectric detection of the millimetre-wave radiation by combining a compact commercial infrared pyro-sensor with a metasurface-enabled ultra-thin absorber, which provides spectrally- and polarization-discriminated response and is 136 times thinner than the operating wavelength. It is demonstrated that, due to the small thickness and therefore the thermal capacity of the absorber, the detector keeps the high response speed and sensitivity to millimetre waves as the original infrared pyro-sensor does against the regime of infrared detection. An in-depth electromagnetic analysis of the ul...

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