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- Title
Exploring the efficacy of subwavelength gratings as short-wavelength infrared filters.
- Authors
Liu, Hezhuang; Huang, Yixuan; Wu, Jiang
- Abstract
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.
- Subjects
OPTICAL elements; OPTICAL devices; MANUFACTURING processes; INFRARED spectra; NANOFABRICATION; LIGHT filters; INFRARED spectroscopy
- Publication
Discover Nano, 2024, Vol 19, Issue 1, p1
- ISSN
2731-9229
- Publication type
Article
- DOI
10.1186/s11671-024-04045-1