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Two-dimensional stretchable blazed wavelength-tunable grating based on PDMS.

Meng-Jing Xu, Yuan-Shen Huang, Zheng-Ji Ni

|October 26, 2020

Summary

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This study presents a stretchable grating made of polydimethylsiloxane (PDMS) that allows for wavelength tuning. Researchers demonstrated wavelength tunability by altering the groove angle, enhancing spectrometer sensitivity.

Area of Science:

Optics and Photonics
Materials Science

Background:

Diffraction gratings are crucial optical components.
Tunable gratings offer enhanced spectral analysis capabilities.
Stretchable materials provide novel platforms for tunable optics.

Purpose of the Study:

To develop a two-dimensional stretchable blazed wavelength-tunable grating.
To investigate the relationship between mechanical strain and blazed wavelength tuning.
To demonstrate the application of the tunable grating for enhanced spectrometer sensitivity.

Main Methods:

Fabrication of a blazed grating using polydimethylsiloxane (PDMS).
Mechanical stretching of the grating along the Y-axis (along grating line) and X-axis (perpendicular to grating line) within its elastic limit.

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Maintaining a fixed grating period by controlling the +1st-order spot position.

Modulating the groove angle to tune the blazed wavelength.

Main Results:

Achieved wavelength tuning by altering the groove angle through mechanical stretching.
Stretching the PDMS grating by 20% (Y-axis) and 5.2% (X-axis) reduced the groove angle by 1.33°.
Observed a 42.3 nm shift in the first-order diffraction blazed wavelength towards shorter wavelengths.
Demonstrated enhanced spectrometer sensitivity by tuning the grating's blazed wavelength to spectral peaks between 460.8 nm and 503.1 nm.

Conclusions:

A novel two-dimensional stretchable blazed wavelength-tunable grating based on PDMS was successfully demonstrated.
Mechanical strain provides an effective method for tuning the blazed wavelength of the grating.
The tunable PDMS grating shows potential for improving spectrometer performance and enabling advanced spectral analysis.