Design of a flat field concave-grating-based micro-Raman spectrometer for environmental applications

Area of Science:

• Optics and Photonics
• Microfabrication
• Spectroscopy

Background:

• Concave gratings are essential optical components in spectrometers.
• Designing microfabricated concave gratings can be complex and time-consuming.
• Existing design methods may not be optimized for miniaturized systems.

Purpose of the Study:

• To develop simplified algorithms for rapid characterization of microfabricated concave gratings.
• To assist system designers in optimizing grating parameters for specific applications.
• To demonstrate the feasibility of designing a compact micro-Raman spectrometer.

Main Methods:

• Development of simplified algorithms for concave grating characterization.
• Utilizing ray-tracing software for design parameter determination.
• Focusing on a flat field microconcave grating with a 4 mm radius.

Main Results:

• The developed algorithms allow for fast and accurate characterization.
• A feasible design for a microconcave grating suitable for a micro-Raman spectrometer was achieved.
• The proposed microspectrometer operates from 785 nm to 1000 nm with 2 nm resolution at 900 nm.

Conclusions:

• Simplified algorithms streamline the design of microfabricated concave gratings.
• The design is suitable for compact micro-Raman spectrometers for environmental monitoring.
• This work contributes to the development of miniaturized spectroscopic systems.