Lattice-plasmon-induced asymmetric transmission in two-dimensional chiral arrays

Apurv Chaitanya N, Butt M, Reshef O, Boyd RW, Banzer P, De Leon I (2022)

Publication Type: Journal article

Publication year: 2022

Journal

APL Photonics American Institute of Physics (AIP)

Book Volume: 7

Article Number: 016105

Journal Issue: 1

DOI: 10.1063/5.0074849

Abstract

Asymmetric transmission - direction-selective electromagnetic transmission between two ports - is a phenomenon exhibited by two-dimensional chiral systems. The possibility of exploiting this phenomenon in chiral metasurfaces opens exciting possibilities for applications such as optical isolation and routing without external magnetic fields. This work investigates optical asymmetric transmission in chiral plasmonic metasurfaces supporting lattice plasmon modes and unveils its physical origins. We show numerically and experimentally that asymmetric transmission is caused by an unbalanced excitation of such lattice modes by circularly polarized light of opposite handedness. The excitation efficiencies of the lattice modes, and hence, the strength of the asymmetric transmission, are controlled by engineering the in-plane scattering of the individual plasmonic nanoparticles such that the maximum scattering imbalance occurs along one of the in-plane diffraction orders of the metasurface. Furthermore, we show that only the nonzero diffraction orders contribute to this effect. By highlighting the role of the localized plasmon modes supported by the nanoparticle and their radiative coupling to the lattice structure, our study provides a guideline for designing metasurfaces with asymmetric transmission enabled by lattice plasmons.

Authors with CRIS profile

Muhammad Butt Naturwissenschaftliche Fakultät Peter Banzer Lehrstuhl für Experimentalphysik (Optik)

Involved external institutions

University of Ottawa CA Canada (CA) Tecnológico de Monterrey (ITESM) MX Mexico (MX) Max Planck-University of Ottawa Centre for Extreme and Quantum Photonics (MPC-EQP) CA Canada (CA)

How to cite

APA:

Apurv Chaitanya, N., Butt, M., Reshef, O., Boyd, R.W., Banzer, P., & De Leon, I. (2022). Lattice-plasmon-induced asymmetric transmission in two-dimensional chiral arrays. APL Photonics, 7(1). https://dx.doi.org/10.1063/5.0074849

MLA:

Apurv Chaitanya, N., et al. "Lattice-plasmon-induced asymmetric transmission in two-dimensional chiral arrays." APL Photonics 7.1 (2022).

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