30 August 2017 Polarization-selective infrared bandpass filter based on a two-layer subwavelength metallic grating
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Abstract
We present the design, fabrication, and characterization of a polarization-selective infrared bandpass filter based on a two-layer subwavelength metallic grating for use in polarimetric imaging. Gold nanowires were deposited via physical vapor deposition (PVD) onto a silicon surface relief grating that was patterned using electron beam lithography (EBL) and fabricated using standard silicon processing techniques. Optical characterization with a broad-spectrum tungsten halogen light source and a grating spectrometer showed normalized peak TM transmission of 53% with a full-width at half-maximum (FWHM) of 122 nm, which was consistent with rigorous coupled-wave analysis (RCWA) simulations. Simulation results suggested that device operation relied on suppression of the TM transmission caused by surface plasmon polariton (SPP) excitation at the gold-silicon interface and an increase in TM transmission caused by a Fabry-Perot (FP) resonance in the cavity between the gratings. TE rejection occurred at the initial air/gold interface. We also present simulation results of an improved design based on a two-dielectric grating where two different SPP resonances allowed us to improve the shape of the passband by suppressing the side lobes. This newer design resulted in improved side-band performance and increased peak TM transmission.
Conference Presentation
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrew J. Hohne, Andrew J. Hohne, Benjamin Moon, Benjamin Moon, Carol L. Baumbauer, Carol L. Baumbauer, Tristan Gray, Tristan Gray, James Dilts, James Dilts, Joseph A Shaw, Joseph A Shaw, David L. Dickensheets, David L. Dickensheets, Wataru Nakagawa, Wataru Nakagawa, } "Polarization-selective infrared bandpass filter based on a two-layer subwavelength metallic grating", Proc. SPIE 10407, Polarization Science and Remote Sensing VIII, 104070H (30 August 2017); doi: 10.1117/12.2273065; https://doi.org/10.1117/12.2273065
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