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Corner-Promoted Focus Enhancement of Light in Conical Holes for Extraordinary Optical Transmission
IEEE Sensors Journal ( IF 4.3 ) Pub Date : 2021-02-18 , DOI: 10.1109/jsen.2021.3053273
Simon Chun Kiat Goh , Li Lynn Shiau , Liangxing Hu , Nan Chen , Zhihao Ren , Chengkuo Lee , Chuan Seng Tan

Extraordinary optical transmission (EOT) is generated when light transmits through an array of subwavelength holes on a metallic sheet. Most studies have focused on the EOT effect with ideal cylindrical holes. Subsequently, it has been recognized that imperfection in hole fabrication could alter light-matter interaction. Later, adiabatic taper is reported to promote light nano-focusing effect in the optical and near infrared wavelength regime. Due to geometrical and fabrication constraints, it is difficult to fabricate adiabatic taper for mid-infrared responsive nanohole array. In this work, we report the construction of nanohole arrays with varying near-adiabatic taper holes. We demonstrate that when the positive (inverted conic) angle increases from 10° to 20°, the peak full width half maximum (FWHM) improves by 14% from 800 to 700nm, respectively. Furthermore, inverted conical hole is shown to be superior to negative conic angle. Unlike cylindrical hole array, conical hole array maintains high transmission throughput for any given hole dimension while achieving better FWHM. The betterment in performance for conical over cylindrical holes is attributed to a localized plasmonic effect at the terminal exit. Subsequently, the device is demonstrated as a CO 2 low flow sensor. The highest sensor sensitivity is determined to be between 1–4sccm.

中文翻译:

角孔促进圆锥孔中光的聚焦增强,以实现非凡的光学传输

当光透过金属板上的亚波长孔阵列时,会产生非凡的光传输(EOT)。大多数研究都集中在理想圆柱孔的EOT效应上。随后,已经认识到,孔制造中的缺陷会改变光物质的相互作用。后来,据报道绝热锥度可以在光学和近红外波长范围内促进光纳米聚焦效果。由于几何和制造方面的限制,很难为中红外响应纳米孔阵列制造绝热锥度。在这项工作中,我们报告了具有变化的近绝热锥孔的纳米孔阵列的构造。我们证明,当正(倒圆锥)角从10°增大到20°时,半峰全宽(FWHM)从800nm增大到700nm时提高了14%,分别。此外,倒圆锥形孔显示出优于负圆锥角。与圆柱孔阵列不同,圆锥孔阵列可在任何给定孔尺寸下保持较高的传输吞吐量,同时实现更好的FWHM。圆锥形孔在圆柱孔上的性能改善归因于末端出口处的局部等离激元效应。随后,将该设备演示为CO 2个低流量传感器。传感器的最高灵敏度确定为1-4sccm。
更新日期:2021-03-05
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