Selective Pyroelectric Detection of Millimetre Waves Using Ultra-Thin Metasurface Absorbers.
Selective Pyroelectric Detection of Millimetre Waves Using Ultra-Thin Metasurface Absorbers.
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DOI：
10.1038/srep21079
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发表时间：
2016-02-16
影响因子：
4.6
通讯作者：
Arzhannikov AV
中科院分区：
文献类型：
--
作者：
Kuznetsov SA;Paulish AG;Navarro-Cía M;Arzhannikov AV
感测红外辐射是用热释电探测器廉价地完成的，热释电探测器在被入射红外辐射加热时产生临时电压。不幸的是，这些探测器的性能在较长波长下会恶化，从而使例如毫米波辐射的探测成为昂贵的方法。我们在这里提出了一个简单而有效的方法，以提高毫米波辐射的热电检测相结合的紧凑型商业红外热传感器与超表面启用超薄吸收器，它提供光谱和偏振歧视的响应，是136倍薄的工作波长。结果表明，由于吸收体的厚度小，因此，热容量，探测器保持了高的响应速度和灵敏度的毫米波的原始红外热传感器不对红外探测的制度。深入的电磁分析的超薄谐振吸收沿着与他们的复杂表征的BWO光谱技术。基于这一初步研究，集成超颖表面吸收体热释电传感器的实施和实验测试，表现出高灵敏度和非常快的响应毫米波辐射。所提出的方法为在毫米波和太赫兹波段创建高效廉价的紧凑型光谱偏振传感器铺平了道路。
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 ultra-thin resonant absorbers along with their complex characterization by a BWO-spectroscopy technique is presented. Built upon this initial study, integrated metasurface absorber pyroelectric sensors are implemented and tested experimentally, showing high sensitivity and very fast response to millimetre-wave radiation. The proposed approach paves the way for creating highly-efficient inexpensive compact sensors for spectro-polarimetric applications in the millimetre-wave and terahertz bands.