Fabry-Perot cavity resonance enabling highly polarization-sensitive double-layer gold gratingopen access
- Authors
- Hwang, Jehwan; Oh, Boram; Kim, Yeongho; Silva, Sinhara; Kim, Jun Oh; Czaplewski, David A.; Ryu, Jong Eun; Kim, Eun Kyu; Urbas, Augustine; Zhou, Jiangfeng; Ku, Zahyun; Lee, Sang Jun
- Issue Date
- Oct-2018
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- SCIENTIFIC REPORTS, v.8, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 8
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/149269
- DOI
- 10.1038/s41598-018-32158-y
- ISSN
- 2045-2322
- Abstract
- We present experimental and theoretical investigations on the polarization properties of a single- and a double-layer gold (Au) grating, serving as a wire grid polarizer. Two layers of Au gratings form a cavity that effectively modulates the transmission and reflection of linearly polarized light. Theoretical calculations based on a transfer matrix method reveals that the double-layer Au grating structure creates an optical cavity exhibiting Fabry-Perot (FP) resonance modes. As compared to a single-layer grating, the FP cavity resonance modes of the double-layer grating significantly enhance the transmission of the transverse magnetic (TM) mode, while suppressing the transmission of the transverse electric (TE) mode. As a result, the extinction ratio of TM to TE transmission for the double-layer grating structure is improved by a factor of approximately 8 in the mid-wave infrared region of 3.4-6 mu m. Furthermore, excellent infrared imagery is obtained with over a 600% increase in the ratio of the TM-output voltage (V-theta=0 degrees) to TE-output voltage (V-theta=90 degrees). This double-layer Au grating structure has great potential for use in polarimetric imaging applications due to its superior ability to resolve linear polarization signatures.
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