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Reflection-type multiorder grating lens for three ultraviolet wavelengths.

S Ura¹, Y Honzawa, T Suhara

¹Graduate School of Engineering, Osaka University, 2-1 Yamada-Oka, Suita, Osaka 5650871, Japan. ura@ele.eng.osaka-u.ac.jp

|March 6, 2008

Summary

This summary is machine-generated.

A novel blazed grating lens enables simultaneous sensing of nitrogen oxides (NOx) and sulfur dioxide (SO2) using multiple UV wavelengths. This diffraction grating provides consistent wave-front conversion for accurate gas density measurements.

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Area of Science:

Optics and Photonics
Spectroscopy
Materials Science

Background:

Gas sensing technologies are crucial for environmental monitoring.
Ultraviolet (UV) spectroscopy offers a sensitive method for detecting pollutants like nitrogen oxides (NOx) and sulfur dioxide (SO2).
Developing versatile optical components is key to advancing multi-wavelength sensing systems.

Purpose of the Study:

To design and fabricate a single reflection grating lens capable of consistent wave-front conversion across multiple UV wavelengths.
To enable simultaneous detection of NOx and SO2 gas densities using a single optical element.
To evaluate the performance and efficiency of the fabricated grating lens.

Main Methods:

Utilized second-, third-, and fourth-order diffraction principles.
Fabricated a blazed grating lens using a planar process.
Characterized the grating lens performance using UV lamps at 420, 280, and 210 nm.

Main Results:

Achieved identical wave-front conversion for 420, 280, and 210 nm UV wavelengths.
Measured diffraction efficiencies of 80% (2nd order, 420 nm), 70% (3rd order, 280 nm), and 30% (4th order, 210 nm).
Demonstrated the feasibility of using a single grating lens for multi-wavelength gas sensing.

Conclusions:

The blazed grating lens effectively provides consistent wave-front conversion for UV sensing applications.
The developed optical component supports simultaneous detection of NOx and SO2, enhancing sensing capabilities.
This technology offers a promising approach for compact and efficient environmental gas monitoring systems.