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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Tabletop Tunable Chiral Photonic Emitter.

Lu Wang¹, Marcelo Fabián Ciappina^2,3,4, Thomas Brabec⁵

¹<a href="https://ror.org/01cxn9s23">State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics</a>, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China.

Physical Review Letters

|September 27, 2024

Summary

This summary is machine-generated.

Researchers developed a compact tunable chiral emitter using Weyl semimetals for generating chiral light in terahertz and ultraviolet ranges. This breakthrough simplifies chiral photonics applications.

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Area of Science:

Optics and Photonics
Condensed Matter Physics
Materials Science

Background:

Chiral light, with its spiral trajectory, is crucial for light-matter interactions.
Generating and controlling chiral pulses, especially in terahertz (THz) and ultraviolet (UV) ranges, faces challenges due to limitations in optical elements.
Existing methods for chiral light generation often involve complex optical systems, magnetic fields, or metamaterials.

Purpose of the Study:

To propose a novel, versatile, and tunable chiral emitter.
To address the challenges in generating chiral pulses in the THz and UV spectral ranges.
To offer a compact and simplified solution for chiral light generation.

Main Methods:

Leveraging the high harmonic generation (HHG) process.
Utilizing two planar Weyl semimetal slabs as the core components.
Designing a configuration for effective pulse manipulation in THz and UV frequencies.

Main Results:

Demonstration of a tunable chiral emitter based on Weyl semimetals.
Successful generation of chiral pulses in both THz and UV spectral ranges.
A simplified optical configuration compared to conventional methods.

Conclusions:

The proposed Weyl semimetal-based emitter offers a compact and tunable platform for chiral light generation.
This advancement overcomes limitations in THz and UV chiral pulse manipulation.
The platform has the potential to be a foundational element for integrated chiral photonics.