Journal ArticleDOI
Realization of high-contrast gratings operating at 10 μm.
Brian Hogan,Stephen P. Hegarty,Liam Lewis,Javier Romero-Vivas,Tomasz J. Ochalski,Guillaume Huyet +5 more
TLDR
A new material pairing is presented that can be used to realize high-contrast gratings at wavelengths of 10 μm and greater using only optical lithography, and it is experimentally shown that the spectral response of gratings that are fabricated using such a process show good agreement with theoretically predicted performance.Abstract:
We present a new material pairing that can be used to realize high-contrast gratings at wavelengths of 10 μm and greater Using only optical lithography, the material pair solves the absorption issue limiting the popular Si/SiO2 pairing from operation above 6 μm We describe the obstacles that exist with the currently used grating materials for this wavelength range and outline why our chosen materials overcome this obstacle We numerically demonstrate that gratings utilizing these materials are capable of wideband high reflectivity We experimentally show that the spectral response of gratings that are fabricated using such a process show good agreement with theoretically predicted performanceread more
Citations
More filters
Journal ArticleDOI
Polarization-insensitive beam splitters using all-dielectric phase gradient metasurfaces at visible wavelengths.
TL;DR: This study proposes and numerically examine polarization-insensitive beam splitters utilizing two-step phase gradient all-dielectric metasurfaces in the visible spectrum using a special phase gradient whose sign changes periodically.
Journal ArticleDOI
Fabrication methods for infrared resonant devices.
TL;DR: Detailed fabrication blueprints for achieving robust and repeatable results for devices in this region are presented and are applicable in most labs with ordinary fabrication resources.
Journal ArticleDOI
Unpolarized resonant notch filters for the 8-12 µm spectral region.
TL;DR: This work designs, fabrication, and testing of polarization independent bandstop filters based on the guided-mode resonance (GMR) effect, and successfully fabricates prototype filters in the Ge-on-ZnSe materials system focusing on the zero-contrast grating architecture.
Journal ArticleDOI
High-quality large-scale electron-beam-written resonant filters for the long-wave infrared region
Neelam Gupta,Junyeob Song +1 more
TL;DR: Large-scale, high-quality spectral filters operating in the long-wave infrared (LWIR) spectral region are presented and their polarization dependence and spectral tuning performance are characterized using a tunable quantum cascade laser system that spans the ∼7-13µm spectral band.
Journal ArticleDOI
Mid-infrared Optical Sensing Using Sub-Wavelength Gratings
TL;DR: Experimentally, using a sub-wavelength grating the detection of ethanol in aqueous solution is demonstrated by interrogating its large absorption band at 9.54 μm, and theoretically it is theoretically demonstrated how sub-Wavelength gratings can detect changes in the real part of the refractive index, similar to conventional refractiveIndex sensors.
References
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Journal ArticleDOI
Formulation for stable and efficient implementation of the rigorous coupled-wave analysis of binary gratings
TL;DR: In this paper, the authors presented a stable and efficient numerical implementation of the analysis technique for one-dimensional binary gratings for both TE and TM polarization and for the general case of conical diffraction.
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Stable implementation of the rigorous coupled-wave analysis for surface-relief gratings: enhanced transmittance matrix approach
TL;DR: In this paper, an enhanced, numerically stable transmittance matrix approach is developed and is applied to the implementation of the rigorous coupled-wave analysis for surface-relief and multilevel gratings.
Journal ArticleDOI
Highly improved convergence of the coupled-wave method for TM polarization
TL;DR: In this article, Li and Haggans analyzed the convergence rate of the coupled-wave method for TM polarization of metallic lamellar gratings and provided numerical evidence that highly improved convergence rates similar to the TE polarization case can be obtained.
Journal ArticleDOI
Mid-infrared optical properties of thin films of aluminum oxide, titanium dioxide, silicon dioxide, aluminum nitride, and silicon nitride
Jan Kischkat,Sven Peters,Bernd Gruska,Mykhaylo P. Semtsiv,Mikaela Chashnikova,Matthias Klinkmüller,O. Fedosenko,S. Machulik,A. Aleksandrova,Gregorii Monastyrskyi,Yuri V. Flores,W. Ted Masselink +11 more
TL;DR: The investigation shows how sensitive the refractive index functions are to the O2 and N2 flow rates, and for which growth conditions the materials deposit homogeneously, and allows conclusions to be drawn on the degree of amorphousness and roughness.
Journal ArticleDOI
Ultrabroadband mirror using low-index cladded subwavelength grating
TL;DR: In this article, a novel subwavelength grating that has a very broad reflection spectrum and very high reflectivity is presented. But the design is scalable for different wavelengths. And it does not support monolithic integration of optoelectronic devices at a wide range of wavelengths from visible to far infrared.