{"title":"亚波长表面光栅增强长波红外量子点光电探测器的宽带光电流","authors":"Puminun Vasinajindakaw, Guiru Gu, Xuejun Lu","doi":"10.1142/S1793528813500020","DOIUrl":null,"url":null,"abstract":"We report a sub-wavelength transmission surface grating (TSG) enhanced longwave infrared (LWIR) quantum dot photodetector. Broadband photocurrent enhancement covering the wavelength range from 4 μm to 11 μm is observed. A 4.6 times (4.6×) photocurrent enhancement is obtained at the photodetection wavelength of 8.7 μm. By comparing the simulated diffraction efficiency with the photocurrent enhancement spectrum, we attribute the enhancement to the 1st-order diffraction of the normal infrared (IR) incidence radiation. The photodetectivity (D*) enhancement at different biases is also measured and analyzed.","PeriodicalId":106270,"journal":{"name":"Optics and Photonics Letters","volume":"2 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2013-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"BROADBAND PHOTOCURRENT ENHANCEMENT IN LONGWAVE INFRARED QUANTUM DOT PHOTODETECTORS BY SUB-WAVELENGTH SURFACE GRATINGS\",\"authors\":\"Puminun Vasinajindakaw, Guiru Gu, Xuejun Lu\",\"doi\":\"10.1142/S1793528813500020\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We report a sub-wavelength transmission surface grating (TSG) enhanced longwave infrared (LWIR) quantum dot photodetector. Broadband photocurrent enhancement covering the wavelength range from 4 μm to 11 μm is observed. A 4.6 times (4.6×) photocurrent enhancement is obtained at the photodetection wavelength of 8.7 μm. By comparing the simulated diffraction efficiency with the photocurrent enhancement spectrum, we attribute the enhancement to the 1st-order diffraction of the normal infrared (IR) incidence radiation. The photodetectivity (D*) enhancement at different biases is also measured and analyzed.\",\"PeriodicalId\":106270,\"journal\":{\"name\":\"Optics and Photonics Letters\",\"volume\":\"2 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2013-04-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Optics and Photonics Letters\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1142/S1793528813500020\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics and Photonics Letters","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1142/S1793528813500020","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
BROADBAND PHOTOCURRENT ENHANCEMENT IN LONGWAVE INFRARED QUANTUM DOT PHOTODETECTORS BY SUB-WAVELENGTH SURFACE GRATINGS
We report a sub-wavelength transmission surface grating (TSG) enhanced longwave infrared (LWIR) quantum dot photodetector. Broadband photocurrent enhancement covering the wavelength range from 4 μm to 11 μm is observed. A 4.6 times (4.6×) photocurrent enhancement is obtained at the photodetection wavelength of 8.7 μm. By comparing the simulated diffraction efficiency with the photocurrent enhancement spectrum, we attribute the enhancement to the 1st-order diffraction of the normal infrared (IR) incidence radiation. The photodetectivity (D*) enhancement at different biases is also measured and analyzed.
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