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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.

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Related Experiment Video

Updated: Jun 11, 2025

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Published on: February 27, 2019

Miniaturized on-chip spectrometer enabled by electrochromic modulation.

Menghan Tian¹, Baolei Liu², Zelin Lu¹

¹School of Physics, Beihang University, Beijing, 100191, China.

Light, Science & Applications

|September 28, 2024

Summary

This summary is machine-generated.

This study introduces a novel electrochromic filter-based spectrometer that enhances spectral resolution without needing more filters. This breakthrough enables higher performance for portable, low-cost spectral sensing applications.

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Last Updated: Jun 11, 2025

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Area of Science:

Optoelectronics
Spectroscopy
Materials Science

Background:

Miniaturized spectrometers are crucial for portable sensing but face limitations in spectral resolution due to filter count.
Current computational spectrometers struggle to improve resolution without increasing the number of spectral response units.

Purpose of the Study:

To develop a miniaturized computational spectrometer with enhanced spectral resolution using electrochromic filters.
To demonstrate improved spectral resolution and adaptability for hyperspectral imaging.

Main Methods:

Integration of electrochromic filters directly onto photodetector pixels.
Electrochemical modulation of filter spectral response via ion and electron injection.
Experimental validation of spectral resolution improvement with applied voltages.

Main Results:

Achieved a significant decrease in average peak wavelength difference from 1.61 nm to 0.29 nm.
Demonstrated effective operation with as few as two or four filter units.
Confirmed the electrochromic filter's suitability for hyperspectral imaging due to uniform transparency.

Conclusions:

Electrochromic filter modulation offers a new strategy for high-resolution miniaturized spectrometers.
This approach enhances performance for low-cost, portable spectral sensing.
The concept inspires further research into stimulus-responsive filters for spectrometers.