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Chirality

Chirality

Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...

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Broadband plasmonic chiral meta-mirrors.

Eric B Whiting, Lei Kang, Ronald P Jenkins

|July 21, 2023

Summary

Researchers developed a broadband chiral meta-mirror using a genetic algorithm (GA). This device achieves strong, handedness-selective light-matter interactions across an octave bandwidth, enabling applications in chiral optics and nonlinear phenomena.

Area of Science:

Optics and Photonics
Metamaterials
Nanotechnology

Background:

Chiral meta-mirrors enable handedness-selective light-matter interactions at the nanoscale.
Existing chiral meta-mirrors typically exhibit narrowband resonances, limiting their practical applications.
Achieving broadband chiral responses is crucial for advanced optical functionalities.

Purpose of the Study:

To design and validate a chiral meta-mirror with octave bandwidth.
To achieve strong absorption of one circularly polarized light handedness while reflecting the other across a broad spectrum.
To explore the potential for nonlinear chiral optical effects, such as second harmonic generation (SHG).

Main Methods:

Utilized a genetic algorithm (GA) based optimization method for inverse design.

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Numerically validated the performance of the optimized chiral meta-mirror.

Conducted field analysis to understand the origin of the broadband chiroptical response.

Main Results:

Demonstrated a chiral meta-mirror with octave bandwidth (1000-2000 nm).
Achieved strong chiral selectivity, absorbing one circular polarization and reflecting the other.
Attributed the broadband response to multiple chiral resonances supported by the meta-mirror.
Showcased potential for chiral-selective broadband second harmonic generation (SHG) based on the Lorentz reciprocity theorem.

Conclusions:

Advanced inverse-design approaches, like GA, are effective for creating chiral metadevices with sophisticated functionalities.
The developed meta-mirror exhibits strong chiral response in both linear and nonlinear optical regimes.
This work facilitates the development of metadevices for enhanced chiral light-matter interactions.