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Raman Microspectroscopy For Structural Indication In Ultrafast Laser Writing.

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Raman Microspectroscopy For Structural Indication In Ultrafast Laser Writing.

Related Experiment Video

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Published on: December 30, 2025

Raman Microspectroscopy for Structural Indication in Ultrafast Laser Writing.

Xingrui Cheng¹, Eugenio Picheo², Zhixin Chen^1,2

¹Department of Engineering Science, University of Oxford, Oxford, UK.

|March 16, 2026

View abstract on PubMed

Summary

This summary is machine-generated.

Raman microspectroscopy monitors femtosecond laser fabrication of diamond devices. Depletion of a specific Raman line predicts electrical resistance, improving scalability and yield for laser microfabrication.

Keywords:

Raman microspectroscopy diamond electrodes diamond graphitization femtosecond laser writing in‐situ metrology

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Area of Science:

Materials Science
Nanotechnology
Spectroscopy

Background:

Femtosecond laser microfabrication offers versatile device creation but faces scalability challenges due to limited real-time monitoring.
Accurate, in situ performance metrics are crucial for optimizing laser fabrication processes.

Purpose of the Study:

To demonstrate Raman microspectroscopy as a non-destructive tool for assessing the electrical performance of laser-written graphitic electrodes in diamond.
To identify reliable spectral indicators correlating with device resistance for improved fabrication control.

Main Methods:

Combined hyperspectral Raman mapping with in situ electrical testing of laser-fabricated graphitic electrodes in diamond.
Analyzed spectral features, focusing on the 1332 cm⁻¹ sp³ Raman line, to correlate with electrical resistance.

Applied hyperspectral unmixing for label-free identification of spectral signatures in complex fabrication scenarios.

Main Results:

The depletion of the 1332 cm⁻¹ sp³ Raman line was identified as a monotonic and robust predictor of electrode resistance.
This spectral feature offers superior correlation with electrical performance compared to other commonly used Raman signatures.
Hyperspectral unmixing successfully identified relevant spectral markers even when traditional Raman signals were less distinct.

Conclusions:

Raman microspectroscopy, particularly monitoring the 1332 cm⁻¹ sp³ line, provides a practical in situ metric for evaluating laser-written graphitic electrodes in diamond.
The developed methodology enhances control and predictability in femtosecond laser microfabrication, paving the way for specification-driven processes.
This approach is adaptable to various host materials and functionalities, broadening its applicability in advanced manufacturing.