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Related Experiment Video

Updated: Jan 25, 2026

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

Published on: March 31, 2022

Ultrafast volume holography for stretchable photonic structures.

Nicholas Cheng Yang Tham, Pankaj K Sahoo, Young-Jin Kim

|May 5, 2019

Summary

Researchers developed ultrafast volume holography to create stretchable photonic structures in polydimethylsiloxane (PDMS). This novel method fabricates tunable volume phase gratings (VPGs) without modifying PDMS, enabling advanced lab-on-a-chip devices.

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Last Updated: Jan 25, 2026

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Area of Science:

Photonics
Materials Science
Optical Engineering

Background:

Stretchability and flexibility are crucial for lab-on-a-chip systems.
Polydimethylsiloxane (PDMS) is a promising material for flexible optical elements.
Fabricating VPGs in PDMS is challenging due to complex processes.

Purpose of the Study:

To introduce a novel, simplified method for fabricating stretchable photonic structures.
To enable the direct fabrication of tunable volume phase gratings (VPGs) in unmodified PDMS.
To demonstrate the application of these VPGs in beam steering and spectroscopy.

Main Methods:

Development of "ultrafast volume holography" using fs repetition rate control for heat regulation.
Volumetric patterning to create periodic refractive index modulation in PDMS.
Direct fabrication without the need for post-processing.

Main Results:

Achieved a refractive index modulation of 1.95 × 10^-4 in PDMS.
Successfully fabricated stretchable and tunable VPGs.
Demonstrated VPGs as active beam steering units and tunable spectroscopic elements.

Conclusions:

Ultrafast volume holography offers an efficient method for creating stretchable photonic devices.
The developed VPGs are suitable for high-performance, compact lab-on-a-chip applications.
This technique simplifies the fabrication of flexible optical components.