Mid-infrared holey and slotted photonic crystal waveguides in silicon-on-sapphire for chemical warfare simulant detection

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• 作者：Yi Zou^a ; ¹ ; ^{yzou@utexas.edu" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Swapnajit Chakravarty^b ; ¹ ; ^{swapnajit.chakravarty@omegaoptics.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Parker Wray^aAuthor Vitae ; Ray T. Chen^a ; ^b ; ^{raychen@uts.cc.utexas.edu" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Photonic crystal waveguides ; Mid-Infrared waveguides ; Silicon photonics ; Chemical sensor
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2015
• 出版时间：31 December 2015
• 年：2015
• 卷：221
• 期：Complete
• 页码：1094-1103
• 全文大小：3653 K

文摘

We provide the first experimental demonstration of the transmission characteristics of holey and slotted photonic crystal waveguides (PCWs) in silicon-on-sapphire at mid-infrared wavelength of 3.43 μm. Devices are studied as a function of lattice constant to tune the photonic stop band across the single wavelength of the source laser. In the holey PCW, propagation losses less than 20 dB/cm are observed below the light line while more than 400 dB/cm propagation losses are observed above the light line, characteristic of the waveguiding behavior of photonic crystal line defect modes. Comparison between the holey and slotted PCWs with PCWs without low-index inclusions shows the higher sensitivity to refractive index changes in chemical sensing for the holey and slotted PCWs compared to the regular PCWs. Triethylphosphate (TEP), a chemical warfare simulant, was detected down to a concentration of 10 ppm (parts per million) with a 800 μm long holey PCW in gas phase via optical absorbance signature.