Towards -Symmetric Optical Dimer Fabrication without a Light-Absorbing Material

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Abstract

We consider an approach to engineer an optical dimer of particles operating in the spectral region near the dipolar resonance that exhibits parity–time symmetry-like features. Both particles are assumed to be made of a gain medium with the same refractive index and extinction coefficient. We suggest introducing a gain–loss contrast by altering the radiative loss of the particles through changing their shape. To demonstrate our approach, we consider a dimer of infinite filled and hollow cylinders. We demonstrate that a larger hollow diameter leads to a stronger radiative decay. Then we find the parameters of a dimer that has an exceptional point at a real frequency and exhibits two real eigenfrequencies when the gain–loss contrast is decreased.

About the authors

A. A Dmitriev

School of Physics and Engineering, ITMO University, 197101, St. Petersburg, Russia

Email: alexey.dmitriev@metalab.ifmo.ru

K. V Baryshnikova

School of Physics and Engineering, ITMO University, 197101, St. Petersburg, Russia

Email: alexey.dmitriev@metalab.ifmo.ru

M. V Rybin

Ioffe Institute, 194021, St. Petersburg, Russia

Author for correspondence.
Email: alexey.dmitriev@metalab.ifmo.ru

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