Improvement of infrared single-photon detectors absorptance by integrated plasmonic structures.
Improvement of infrared single-photon detectors absorptance by integrated plasmonic structures.
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DOI：
10.1038/srep02406
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发表时间：
2013
影响因子：
4.6
通讯作者：
Berggren, Karl K.
中科院分区：
文献类型：
--
作者：
Csete, Maria;Sipos, Aron;Szalai, Aniko;Najafi, Faraz;Szabo, Gabor;Berggren, Karl K.
等离子体结构在光电探测器开发中开辟了新的途径。报道了优化的照明配置以改善包括短周期和长周期氮化铌（NbN）条带图案的超导纳米线单光子检测器（SNSPD）中的p偏振光吸收率。在OC-SNSPD中，由于纳米腔底部的电场集中，在垂直入射到P取向的NbN图案上时，可以获得最高的吸收率。在NCAI-SNSPD集成纳米腔阵列组成的垂直和水平的黄金段离轴照明在S-取向的结果在极角无关的完美吸收率通过集体共振在短周期的设计，而在长周期的NCAI-SNSPD光栅耦合表面波促进EM场传输到NbN条纹，并导致局部吸收率最大值。在NCDAI-SNSPD集成纳米腔偏转器阵列组成的较长的垂直金段大的吸收率最大值出现在3 p周期的设计，由于电场增强通过光栅耦合表面波同步的NbN条纹在S-取向，这使得补偿填充因子相关的倒退。
Plasmonic structures open novel avenues in photodetector development. Optimized illumination configurations are reported to improve p-polarized light absorptance in superconducting-nanowire single-photon detectors (SNSPDs) comprising short- and long-periodic niobium-nitride (NbN) stripe-patterns. In OC-SNSPDs consisting of ~quarter-wavelength dielectric layer closed by a gold reflector the highest absorptance is attainable at perpendicular incidence onto NbN patterns in P-orientation due to E-field concentration at the bottom of nano-cavities. In NCAI-SNSPDs integrated with nano-cavity-arrays consisting of vertical and horizontal gold segments off-axis illumination in S-orientation results in polar-angle-independent perfect absorptance via collective resonances in short-periodic design, while in long-periodic NCAI-SNSPDs grating-coupled surface waves promote EM-field transportation to the NbN stripes and result in local absorptance maxima. In NCDAI-SNSPDs integrated with nano-cavity-deflector-array consisting of longer vertical gold segments large absorptance maxima appear in 3p-periodic designs due to E-field enhancement via grating-coupled surface waves synchronized with the NbN stripes in S-orientation, which enable to compensate fill-factor-related retrogression.
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影响因子：
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