Optimally designed narrowband guided-mode resonance transmittance filters for label-free optical biosensor

Dang, Phuc Toan; Lee, Jihoon

doi:10.1117/12.2545941

Cited by 1 publication

(1 citation statement)

References 9 publications

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“…In the past decades, subwavelength structures have been extensively investigated and has facilitated the advancement of integrated photonics, focusing on the miniaturization of photonic systems [9]. Extensive research efforts have been devoted to narrowband filters, utilizing techniques such as Fabry-Pérot resonators [10], combinatorial deposited thin films [11], dielectric metasurfaces [12,13], guided-mode resonance (GMR) filters [14,15], linear variable filters [16] and subwavelength gratings [17]. To achieve spectral measurements, simultaneous multiband measurements are desirable, prompting the integration of multiband filter arrays onto a single chip.…”

Section: Introductionmentioning

confidence: 99%

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

Liu,

Huang,

2024

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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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