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Responsivity enhancement of mid-infrared PbSe detectors using CaF2 nano-structured antireflective coatings
| Content Provider | Semantic Scholar |
|---|---|
| Author | Weng, Binbin Qiu, Jijun Yuan, Zijian Larson, Preston R. Strout, Gregory W. Shi, Zhisheng |
| Copyright Year | 2014 |
| Abstract | The CaF2 nano-structures grown by thermal vapor deposition are presented. Significant responsivity improvement (>200%) of mid-infrared PbSe detectors incorporating a 200 nm nano-structured CaF2 coating was observed. The detector provides a detectivity of 4.2 × 1010 cm · Hz1/2/W at 3.8 μm, which outperforms all the reported un-cooled PbSe detectors. Structural investigations show that the coating is constructed by tapered-shape nanostructures, which creates a gradient refractive-index profile. Analogy to moth-eye antireflective mechanism, the gradient refractive-index nanostructures play the major roles for this antireflection effect. Some other possible mechanisms that help enhance the device performance are also discussed in the work. |
| Starting Page | 021109 |
| Ending Page | 021109 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1063/1.4861186 |
| Volume Number | 104 |
| Alternate Webpage(s) | http://www.ou.edu/content/dam/CoE/ECE/weng/docs/14-Responsivity%20enhancement%20of%20mid-IR%20%20detectors%20using%20nano%20antireflective%20coatings.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
