DMD-based software-configurable spatially-offset Raman spectroscopy for spectral depth-profiling of optically turbid...

Area of Science:

• Spectroscopy
• Optical Physics
• Materials Science

Background:

• Spectral depth-profiling of optically turbid samples is crucial for various applications.
• Existing spatially-offset Raman spectroscopy (SORS) methods have limitations in flexibility and complexity.

Purpose of the Study:

• To introduce a novel method for SORS using a digital micro-mirror device (DMD).
• To enable flexible and efficient depth-profiling measurements of turbid samples.

Main Methods:

• Incorporation of a DMD into the sample-conjugate plane of the detection optical path.
• Programmable collection/rejection of light at specific spatial positions.
• Demonstration of various detection geometries (annular, simultaneous multi-offset) for macro- and micro-SORS.

Main Results:

• The DMD-based SORS method allows for arbitrary spatial control of Raman signal collection.
• Multiple detection geometries can be implemented on a single instrument.
• Effective subsurface Raman collection is achieved with minimal experimental complexity.

Conclusions:

• DMD-based SORS offers enhanced flexibility for spectral depth-profiling compared to other SORS modalities.
• This technique provides a versatile platform for analyzing optically turbid samples.
• The method is suitable for both macro- and micro-scale SORS measurements.