CC BY
5Magnetically induced exceptional points in helically structured
1D photonic crystals
A.A. Malinchenko1*, A.O. Kamenev12, N.A. Vanyushkin1, I.M. Efimov1, S.S. Golik1,
V.G. Chigrinov3, A.H. Gevorgyan1'2
1- Far Eastern Federal University, Institute of High Technologies and Advanced Materials, 10 Ajax Bay,
Russky Island, Vladivostok 690922, Russia 2- Institute of Automation and Control Processes, Far East Branch, Russian Academy of Sciences, 690041
Vladivostok, Russia
3- Foshan University, School of Physics and Optoelectronic Engineering, 528011 Foshan, China
In the past years, the research on exceptional points has been growing enormously especially in optics and photonics [1,2]. In photonics exceptional points have been connected to a plethora of interesting effects and suggested applications, including ultrasensitive sensors, loss-induced revival of lasing, orbital-angular momentum micro-lasers, chiral perfect absorbers, coherent perfect transmitters, single-mode lasing, electromagnetically induced transparency, optical amplifiers, and optical filters with sharp transmission peaks, ideal unidirectional transmitter, etc. The research exceptional points is still a vital field with important open problems. One of the main tasks is the tunability of exceptional points, but by changing the applied external fields rather than changing exactly the structure of the system itself. Since, once the necessary nanostructures are created, as a rule, their parameters are difficult to change so the possibility of controllability is practically lost. Thus, creating systems with externally field-tunable exceptional points is a highly demanding task [3]. Here we investigated the linear nonreciprocal and tunable in helically structured 1D photonic crystals in external magnetic field when the parameter of magneto-optical activity g is constant and is independent of wavelength. We will demonstrate the existence of this effect and its tunability. We will investigate some new and interesting features of this effect, too.
[1] A.H. Castro Neto, F. Guinea, N.M.R. Peres, K.S. Novoselov, A.K. Geim, The electronic properties of graphene, Rev. Mod. Phys. 81, 109 (2009).
[2] M.-A. Miri and A. Alu, Exceptional points in optics and photonics, Science 363, eaar7709 (2019).
[3] A.H. Gevorgyan, Exceptional points and lines and Dirac points and lines in magnetoactive cholesteric liquid crystals, J. Mol. Liq., 390, 123180 (2023).
