O-Band Subwavelength Grating Filters in a Monolithic Photonics Technology

Afzal, Francis O.; Bian, Yusheng; Peng, Bo; Hu, Shuren; Aboketaf, Abdelsalam; Dezfulian, Kevin; Nummy, Karen; Stricker, Andy; Hedges, Crystal; Sowinski, Zoey; Rakowski, Michal; Lee, Won Suk; Augur, Rod; Riggs, Dave; Giewont, Ken; Weiss, Sharon M.

doi:10.1109/lpt.2020.3017096

Cited by 9 publications

(2 citation statements)

References 16 publications

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“…So it is possible to concentrate almost all the energy of the incident light on the zeroth-order reflection light by using the HCGs. [33] This phenomenon was then explained as the interference of the internal propagation modes in the input plane and output plane. [34] It can also beexplained as leaky-mode resonance.…”

Section: Methodsmentioning

confidence: 99%

Dual-function beam splitter of high contrast gratings*

et al. 2021

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We present the design and fabrication of a novel dual-function high contrast gratings that can be used as a polarization-selective beam splitter with transverse magnetic polarization, which performs two independent functions, i.e., reflection focusing and power equalization at a wavelength of 1550 nm. This dual-function grating profile is optimized by the rigorous coupled-wave analysis and the finite-element method. Simple analytical expressions of phase and modal guideline for the beam splitter design are given. The beam splitter based on the grating structure is experimentally studied at a distance of 160 μm from the reflection plane, the results are consistent with the theoretical results basically.

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Section: Methodsmentioning

confidence: 99%

Dual-function beam splitter of high contrast gratings*

et al. 2021

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“…Among these efforts, subwavelength grating structures stand out for their facile light manipulation and tunability through grating period variation. Notably, subwavelength gratings have been harnessed to realize polarizers [18], color reflectors [19], narrowband filters [20][21][22][23][24]. For transmission applications, color filters leveraging subwavelength metal-insulator-metal (MIM) stack gratings have been reported [20].…”

Section: Introductionmentioning

confidence: 99%

Exploring the efficacy of subwavelength gratings as short-wavelength infrared filters

Liu,

Huang,

2024

Discover Nano

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Advancements in nanofabrication technology have greatly facilitated research on nanostructures and their associated properties. Among these structures, subwavelength components have emerged as promising candidates for ultra-compact optical elements, can potentially supplant conventional optical components and enable the realization of compact and efficient optical devices. Spectral analysis within the infrared spectrum offers a wealth of information for monitoring crop health, industrial processes, and target identification. However, conventional spectrometers are typically bulky and expensive, driving an increasing demand for cost-effective spectral sensors. Here we investigate three distinct subwavelength grating structures designed to function as narrowband filters within the short-wavelength infrared (SWIR) range. Through simple adjustments to the period of grating strips, these filters selectively transmit light across a wide wavelength range from 1100 to 1700 nm with transmission exceeding 70% and full width at half maximum (FWHM) down to 6 nm. Based on a simple design, the results present great potential of subwavelength grating filters for multiband integration and developing ultra-compact spectral sensors.

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