Unspecified Meng Wang Profile

Meng Wang

at Soochow Univ.

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Proceedings Article | 26 January 2021 Paper

Investigation of narrowband tunable filter based on multilayer waveguide structure

Wan Peng, Guiju Zhang, Meng Wang, Linling Qin

Proceedings Volume 11767, 117671L (2021) https://doi.org/10.1117/12.2592363

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We propose a six-layer waveguide structure embedded in a single layer grating with a microcavity based on the guide mode resonance (GMR) effect, and realized a tunable notch filter in near infrared wavelength. The structure shows a very narrow filtering bandwidth and high tunable resonance absorption. The propagation characteristics are analyzed and calculated by using the finite-element method, and the reflection spectrum shows different properties under different structure parameters. The result of FWHM (full width at half maximum) is less than 0.001nm with a filtering resonance wavelength of 1550nm under a TM polarized incidence. The resonance wavelength is mainly controlled by the period of the grating layer; it shows a red shift from 1536.17nm to 1563.73nm under changing the period from 790nm to 810nm with 5nm interval. The filtering structure presents potential applications in optical communication, noise suppression and optical sensing.

Proceedings Article | 5 November 2020 Paper

Unity integration of Au grating and microfluid for refractive-index sensing

Meng Wang, Yue Jin, Xiaotong Liu, Shaolong Wu, Xiaofeng Li, Linling Qin

Proceedings Volume 11569, 115690U (2020) https://doi.org/10.1117/12.2581714

KEYWORDS: Sensors, Gold, Refractive index, Silica, Reflectivity, Diffraction gratings, Transmittance, Plasmonics, Microfluidics

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Recently, new types of nanostructured surface plasmon resonance sensors (SPR) are developing rapidly, and have a wide application prospect. However, most sensors face the disadvantages of low sensitivity or complex structure, which raise the problems that are not able to detect precisely or cost high price to produce. In this work, we proposed a new type of gold-silicon (Au-Si) nanograting structured SPR sensor, which takes the advantages of characteristics of transmission spectrum easier to detect and mass production. The most importantly, it has relatively high sensitivity compared to the commercial sensors. The structure is also incorporated a microfluidic channel as a slot cavity with Silicon dioxide (SiO₂) cap. In the case of vertical incidence of light, the analyte in the Microfluid cavity will has a high transmission peak in the near infrared band (near the wavelength of 1500nm actually), which will significantly move when the reflective index(RI) of the analyte changes. The electromagnetic fields of the structure is greatly concentrated in the area of the cavity, which contributes to the high sensitivity up to 1063nm/RIU, which refers to the ratio of the change of the movement of the transmission peak to the change of the RI of the analyte. This structure was simple enough to produce on a large scale easily with low price, and easy to detect due to the concentration on the transmission peak, which make it to be a new type of surface plasmon sensor.

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