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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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Ultrathin Optics-Free Spectrometer with Monolithically Integrated LED Excitation.

Tuba Sarwar¹, Pei-Cheng Ku¹

¹Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Ave, Ann Arbor, MI 48109-2122, USA.

|March 26, 2022

Summary

This summary is machine-generated.

This study demonstrates an optics-free semiconductor spectrometer chip with an integrated light-emitting diode (LED). This novel design eliminates external optics for spectral analysis, enabling compact and efficient spectroscopic measurements.

Keywords:

gallium nitride semiconductors reconstructive spectrometers reflection spectroscopy

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Area of Science:

Materials Science
Spectroscopy
Semiconductor Devices

Background:

Traditional spectrometers often require bulky external optics.
Integrating light sources and detectors onto a single chip presents challenges in signal interference and optical path control.

Purpose of the Study:

To demonstrate a monolithically integrated semiconductor spectrometer chip with a light-emitting diode (LED).
To achieve optics-free operation for spectral analysis.
To validate the feasibility of on-chip spectral reconstruction.

Main Methods:

Fabrication of gallium nitride (GaN) based photodetectors with strain-engineered wavelength selectivity.
Monolithic integration of a GaN-based LED with photodetectors.
Implementation of an optical blocking structure to prevent LED-photodetector interference.
Utilizing a computational reconstruction algorithm (NNLS with orthogonal matching pursuit) for spectral analysis.

Main Results:

Successful demonstration of a semiconductor spectrometer chip with integrated LED.
Elimination of the need for external optics in the spectrometer design.
Validation of optics-free reflection spectroscopy using the integrated chip.
Effective spectral reconstruction from reflection spectroscopy data.

Conclusions:

The developed semiconductor spectrometer chip enables compact, optics-free spectral analysis.
Monolithic integration of LEDs and photodetectors with appropriate blocking structures is feasible for spectroscopy.
Computational reconstruction algorithms are effective for signal recovery in integrated spectroscopic systems.