AI Article Synopsis
- * By using a genetic algorithm for optimization, researchers developed a chiral meta-mirror with a wide operational bandwidth from 1000 to 2000 nm, enhancing its performance in chiral light interaction.
- * The study highlights the potential for advanced design techniques to create chiral metadevices with enhanced functionalities, including the ability to generate chiral-selective second harmonic generation.
Article Abstract
Chiral meta-mirrors provide a unique opportunity for achieving handedness-selective strong light-matter interaction at the nanometer scale. Importantly, the chiral resonances observed in chiral meta-mirrors arise from the spin-dependent resonant cavity which, however, is generally narrowband. In this paper, by exploiting a genetic algorithm (GA) based optimization method, we numerically validate a chiral meta-mirror with octave bandwidth. In particular, in the wavelength range from 1000 to 2000 nm, the proposed chiral meta-mirror strongly absorbs circularly polarized light of one handedness while highly reflecting the other. A field analysis indicates that the observed broadband chiroptical response can be attributed to the multiple chiral resonances supported by the optimized meta-mirror across the band of interest. The observed broadband chiral response confirms the potential of advanced inverse-design approaches for the creation of chiral metadevices with sophisticated functionalities. Based on the Lorentz reciprocity theorem, we show that the proposed meta-mirror can enable chiral-selective broadband second harmonic generation (SHG). Our study indicates that the application of advanced inverse-design approaches can greatly facilitate the development of metadevices with strong chiral response in both the linear and nonlinear regimes.
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Article Synopsis
- * By using a genetic algorithm for optimization, researchers developed a chiral meta-mirror with a wide operational bandwidth from 1000 to 2000 nm, enhancing its performance in chiral light interaction.
- * The study highlights the potential for advanced design techniques to create chiral metadevices with enhanced functionalities, including the ability to generate chiral-selective second harmonic generation.
The ability to simultaneous achieve circular dichroism (CD) and wavefront manipulation is extremely important for many practical applications, especially for detecting and imaging. However, many of the previously observed weakness chiral features are limited to nanostructures with complex three-dimensional building configurations, single narrow-band response, and no active tunability, which are getting farther and away from the goal of integration and miniaturization. Here, a platform of bi-layer all-graphene meta-mirrors with spin-selective full-dimensional manipulation is proposed to simultaneously achieve giant dual-band CD response and wavefront shaping, based on the principle of the hybridization coupling.
View Article and Find Full Text PDFNonlinear Chiral Meta-Mirrors: Enabling Technology for Ultrafast Switching of Light Polarization.
Nano Lett
March 2020
Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
Photonic nanostructures that realize ultrafast switching of light polarization are essential to advancements in the area of optical information processing. The unprecedented flexibility of metasurfaces in light manipulation makes them a promising candidate for active polarization control. However, due to the lack of optical materials exhibiting a fast as well as large refractive index change, photonic metadevices capable of ultrafast polarization switching remain elusive.
View Article and Find Full Text PDFPreserving Spin States upon Reflection: Linear and Nonlinear Responses of a Chiral Meta-Mirror.
Nano Lett
November 2017
School of Electrical and Computer Engineering, Georgia Institute of Technology, 777 Atlantic Drive NW, Atlanta, Georgia 30332, United States.
Conventional metallic mirrors flip the spin of a circularly polarized wave upon normal incidence by inverting the direction of the propagation vector. Altering or maintaining the spin state of light waves carrying data is a critical need to be met at the brink of photonic information processing. In this work, we report a chiral metamaterial mirror that strongly absorbs a circularly polarized wave of one spin state and reflects that of the opposite spin in a manner conserving the circular polarization.
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