Design of a grating-based thin-film filter for broadband spectropolarimetry

Kim, Donghyun; Burke, Kieron

doi:10.1364/ao.42.006321

Cited by 18 publications

(4 citation statements)

References 25 publications

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“…The aspect ratio of the metal wire grid is over 20 on the total substrate, which enables the polarizer with high performance. This etching process formula can also be used in the fabrication of wire grid arrays, [ 19 ] which can increase the performance of infrared spectrometers [ 20 ] and display systems. [ 21 ] Finally, in 3–15 μm, we achieve the average TMT at 56.57%, which is almost the highest on silicon substrate without AR coat.…”

Section: Introductionmentioning

confidence: 99%

Large‐Area Wire Grid Polarizer with High Transverse Magnetic Wave Transmittance and Extinction Ratio for Infrared Imaging System

Wang

Chao

Liang

et al. 2022

Advanced Photonics Research

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Infrared (IR) wire grid polarizer is the core device of polarization imaging system with exceptional properties. However, the fabrication of high-quality devices with large area and good uniformity remains challenging. Herein, a new high aspect ratio structure is designed and fabricated, which makes the polarizer have high transverse magnetic (TM) transmittance and extinction ratio in a wide wavelength band. This study also presents some innovations to traditional fabrication processes. These improvements make it easier to fabricate polarizers with good performance as well as large areas. In a very wide wave band (3-15 μm), the extinction ratio is over 32.33 dB. The average TM transmittance of the wire grid layer is 80%, and of the polarizer is 56.57%, which is almost the highest on silicon substrate without antireflection (AR) coating. Meanwhile, the diameter with good uniformity is larger than 30 mm. This method is highly reproducible and can be mass-produced. The polarizer can cover atmospheric IR windows in both 3-5 and 7-12 μm simultaneously, which is suitable in IR imaging systems for remote sensing and astronomy observation.

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Section: Introductionmentioning

confidence: 99%

Large‐Area Wire Grid Polarizer with High Transverse Magnetic Wave Transmittance and Extinction Ratio for Infrared Imaging System

Wang

Chao

Liang

et al. 2022

Advanced Photonics Research

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“…For example, a WGP has been integrated to a photodiode 3 , liquid crystal 4 – 7 , fiber-optics 8 , optical isolators 9 , 10 , semiconductor laser 11 , light-emitting diodes 12 , contact lens 13 , photoelectrochemical solar cells 14 , and a CMOS and CCD imaging sensor 15 – 19 . A WGP has found applications in imaging 20 and spectro-polarimetry 21 , 22 and also in projection displays 23 . Polarimetry using a biomolecular WGP consisting of hybridizing DNA-nanoparticle composites was reported 24 .…”

Section: Introductionmentioning

confidence: 99%

Microscale heat transfer and thermal extinction of a wire-grid polarizer

Sim

Kim

2018

Sci Rep

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We explore heat transfer and thermal characteristics of a wire-grid polarizer (WGP) on a microscale by investigating the effect of various geometrical parameters such as wire-grid period, height, and a fill factor. The thermal properties arise from heat transfer by light absorption and conduction in wire-grids. Fill factor was found to be the most dominant geometrical parameter. For TM polarized light, a higher fill factor with thicker wire-grids increased the temperature. The local temperature was found to rise up to Tmax = 354.5 K. TE polarization tended to produce lower temperature. Thermal extinction due to polarimetric extinction by a WGP was also evaluated and highest extinction was observed to be 4.78 dB, which represents a temperature difference ΔT = 54.3 °C. We expect the results to be useful for WGPs in polarization-sensitive thermal switching applications.

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“…Integration of the polarizer and the optical filter can reduce the device size and eliminate the alignment error, which is important for space-limited applications. In fact, many effects have been made on integrating the WGPs with spectral filters, 5 charge-coupled device (CCD) or complementary metal-oxide semiconductor (CMOS) imagers. 6,7 It is important for the polarizer to transmit only blue light to reduce the use of the blue filter in skylight polarization-based navigation systems, since the shorter wavelength has the more pronounced continuation of the clear-sky E-vector pattern underneath clouds.…”

Section: Introductionmentioning

confidence: 99%

Design of an integrated polarization band-pass filter

Wang

Chu

Zhang

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part N:

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In this study, an integrated polarization band-pass filter was designed; it consists of a bilayer nanowire-grid polarizer and a multilayer dielectric band-pass filter. The grating parameters were optimized by rigorous coupled-wave analysis theory and analyzed by effective medium theory. Transverse magnetic transmission higher than 81% and extinction ratio higher than 1000 were obtained at 400-500 nm, and extremely low transmission in the other spectrum was also realized.

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Design of a grating-based thin-film filter for broadband spectropolarimetry

Cited by 18 publications

References 25 publications

Large‐Area Wire Grid Polarizer with High Transverse Magnetic Wave Transmittance and Extinction Ratio for Infrared Imaging System

Large‐Area Wire Grid Polarizer with High Transverse Magnetic Wave Transmittance and Extinction Ratio for Infrared Imaging System

Microscale heat transfer and thermal extinction of a wire-grid polarizer

Design of an integrated polarization band-pass filter

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