Fabry-Perot cavity resonance enabling highly polarization-sensitive double-layer gold grating
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 μm. Furthermore, excellent infrared imagery is obtained with over a 600% increase in the ratio of the TM-output voltage (Vθ = 0°) to TE-output voltage (Vθ = 90°). 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 03, 2018
- Source ID
- 10.1038/s41598-018-32158-y
Entities
People
- Augustine Urbas
- Boram Oh
- David A Czaplewski
- Eun Kyu Kim
- Jehwan Hwang
- Jiangfeng Zhou
- Jong Eun Ryu
- Jun Oh Kim
- Sang Jun Lee
- Sinhara Silva
- Yeongho Kim
- Zahyun Ku