Hwang, JehwanOh, BoramKim, YeonghoSilva, SinharaKim, Jun OhCzaplewski, David A.Ryu, Jong EunKim, Eun KyuUrbas, AugustineZhou, JiangfengKu, ZahyunLee, Sang Jun2019-05-142019-05-142018-10-03Hwang, J., Oh, B., Kim, Y., Silva, S., Kim, J. O., Czaplewski, D. A., … Lee, S. J. (2018). Fabry-Perot cavity resonance enabling highly polarization-sensitive double-layer gold grating. Scientific reports, 8(1), 14787. doi:10.1038/s41598-018-32158-yhttps://hdl.handle.net/1805/19286We 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.en-USAttribution-NonCommercial-NoDerivs 3.0 United StatesAu gratingsFabry-Perot (FP) resonance modesCavitiesOptical cavityDouble-layer Au gratingSingle-layer Au gratingArticle