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UV–Vis Spectrometers

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...

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Optical Sensing Using Hybrid Multilayer Grating Metasurfaces with Customized Spectral Response.

Mahmoud H Elshorbagy^1,2, Alexander Cuadrado³, Javier Alda²

¹Physics Department, Faculty of Science, Minia University, El-Minya 61519, Egypt.

Sensors (Basel, Switzerland)

|February 10, 2024

Summary

This study presents a novel plasmonic optical sensor based on a hydrogenated amorphous silicon solar cell integrated with a metasurface. This device achieves highly sensitive detection of environmental gas changes, crucial for air quality monitoring.

Keywords:

multilayer grating optoelectronic sensor spectral control surface plasmon resonance

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Area of Science:

Nanophotonics
Plasmonics
Optoelectronics

Background:

Metasurfaces enable precise control over optical responses in photonic and optoelectronic devices.
Narrowing spectral responses enhances the sensitivity of optical sensors to environmental changes.
Nanophotonic elements are foundational for advanced plasmonic optical sensors.

Purpose of the Study:

To design and investigate a novel plasmonic optical sensor utilizing a hydrogenated amorphous silicon thin-film solar cell.
To enhance the optoelectronic response of a solar cell by integrating a metasurface for narrow spectral band operation.
To demonstrate the sensor's capability for highly sensitive detection of changes in the surrounding medium's optical properties.

Main Methods:

Integration of a metasurface, fabricated as a hybrid dielectric multilayer grating, with the metallic top electrode of a hydrogenated amorphous silicon thin-film solar cell.
Generation of plasmonic resonance on top of the solar cell's active layer.
Characterization of the sensor's spectral response, sensitivity, and figure of merit (FOM) at 560 nm using TE polarization.

Main Results:

The integrated system exhibits enhanced optoelectronic response over a narrow spectral band due to plasmonic resonance.
The solar cell functions as a sensor, with its response highly dependent on the overlying medium's optical properties.
Achieved maximum sensitivity (S_B) of 36,707 (mA/W)/RIU and a figure of merit (FOM) of approximately 167 RIU^-1 at 560 nm.

Conclusions:

The developed device demonstrates high sensing performance suitable for detecting minute changes in gas media.
The sensor's optical response and sensitivity are critical for applications in environmental monitoring, including air quality and gas composition analysis.
This hybrid plasmonic metasurface solar cell architecture offers a promising platform for next-generation optical sensing.