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Related Experiment Video

Updated: Mar 2, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Reconfigurable optical manipulation by phase change material waveguides.

Tianhang Zhang¹, Shengtao Mei¹, Qian Wang²

¹Graduate School for Integrative Sciences and Engineering, National University of Singapore, Centre for Life Sciences (CeLS), #05-01, 28 Medical Drive, Singapore 117456. a0113469@u.nus.edu and Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583.

|May 13, 2017

Summary

This summary is machine-generated.

Researchers demonstrate bidirectional nanoscale object transport using a novel phase-change material waveguide. This flexible optical manipulation technology paves the way for advanced lab-on-chip systems.

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Area of Science:

Nanotechnology
Optics
Materials Science

Background:

Dielectric waveguides enable optical manipulation beyond diffraction limits.
Traditional waveguides offer limited, unidirectional transport, hindering advanced lab-on-chip applications.

Purpose of the Study:

To demonstrate bidirectional nanoscale object transport using a phase-change material waveguide.
To explore reconfigurable optical trap arrays for multifunctional manipulation.

Main Methods:

Numerical simulations of a rectangular waveguide made of Ge2Sb2Te5 (GST).
Utilizing femtosecond laser-induced phase transitions in GST to control optical forces.
Investigating amorphous and crystalline phases of GST for pushing and pulling forces.

Main Results:

Achieved bidirectional pushing and pulling forces on trapped nanoscale objects.
Demonstrated continuous transport in both forward and backward directions.
Proposed a reconfigurable optical trap array by inducing phase transitions in GST.

Conclusions:

GST waveguides offer a promising platform for flexible, multifunctional nanoscale manipulation.
This technology supports the development of next-generation, versatile lab-on-chip systems.
Bidirectional transport and reconfigurable arrays enhance the capabilities of optical manipulation.