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Topological Rainbow Concentrator Based on Synthetic Dimension.

Cuicui Lu^1,2,3, Chenyang Wang¹, Meng Xiao⁴

¹Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education, Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China.

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|April 2, 2021

Summary

Researchers developed a topological rainbow concentrator using synthetic dimensions in photonic crystals. This method enables robust trapping of light states at different frequencies, advancing topological photonic devices.

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Area of Science:

Condensed Matter Physics
Photonics
Topological Materials

Background:

Synthetic dimensions offer a novel approach for designing topological photonic devices.
Topological phenomena in photonic systems enable robust light manipulation.

Purpose of the Study:

To propose and demonstrate a method for realizing a topological rainbow concentrator using synthetic dimensions.
To leverage topological properties in photonic crystals for frequency-selective light trapping.

Main Methods:

Constructing a synthetic dimension using the translational degree of freedom of nanostructures within a 2D photonic crystal unit cell.
Inducing nontrivial topology in the synthetic dimension through translational deformation.
Controlling the trapping of different frequencies by modulating interface state group velocities.

Main Results:

Demonstrated robust interface states at different frequencies due to nontrivial topology in the synthetic dimension.
Achieved frequency-controlled trapping of topological states, forming a topological rainbow.
Showcased tunability of operation frequency and bandwidth by adjusting the photonic crystal's band gap.

Conclusions:

The proposed method provides a general scheme for creating topological rainbow concentrators.
This approach is applicable to various photonic crystals, facilitating the development of advanced topological photonic devices.