Exceptional Points through Variation of Distances between Four Coaxial Dielectric Disks

Pichugin, Konstantin; Sadreev, Almas; Bulgakov, Evgeny

doi:10.3390/photonics8110460

Open AccessArticle

Exceptional Points through Variation of Distances between Four Coaxial Dielectric Disks

by

Konstantin Pichugin

¹

,

Almas Sadreev

^1,2,*

and

Evgeny Bulgakov

¹

Federal Research Center KSC SB RAS, Kirensky Institute of Physics, 660036 Krasnoyarsk, Russia

²

Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China

^*

Author to whom correspondence should be addressed.

Photonics 2021, 8(11), 460; https://doi.org/10.3390/photonics8110460

Submission received: 4 August 2021 / Revised: 15 October 2021 / Accepted: 15 October 2021 / Published: 21 October 2021

(This article belongs to the Section Optoelectronics and Optical Materials)

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Abstract

By variation of a refractive index and aspect ratio of the isolated disk, we achieved exceptional points (EPs) at which the resonant frequencies and resonant modes coalesce. However, in practice, that kind of variation presents a technological problem. We considered the method to avoid the problem by substitution of two disk’s dimers. In each dimer, variation of the distance between disks was equivalent to a variation of the aspect ratio of the dimer. Moreover, the variation of the distance between dimers provides the second parameter that gives rise to a vast number of EPs. We recovered the initial resonant eigenmode by encircling multiple EPs two, three, and four times in the two-dimensional parametric space of distances.

Keywords: resonant eigenmodes; multiple exceptional points; encircling of exceptional points

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MDPI and ACS Style

Pichugin, K.; Sadreev, A.; Bulgakov, E. Exceptional Points through Variation of Distances between Four Coaxial Dielectric Disks. Photonics 2021, 8, 460. https://doi.org/10.3390/photonics8110460

AMA Style

Pichugin K, Sadreev A, Bulgakov E. Exceptional Points through Variation of Distances between Four Coaxial Dielectric Disks. Photonics. 2021; 8(11):460. https://doi.org/10.3390/photonics8110460

Chicago/Turabian Style

Pichugin, Konstantin, Almas Sadreev, and Evgeny Bulgakov. 2021. "Exceptional Points through Variation of Distances between Four Coaxial Dielectric Disks" Photonics 8, no. 11: 460. https://doi.org/10.3390/photonics8110460

APA Style

Pichugin, K., Sadreev, A., & Bulgakov, E. (2021). Exceptional Points through Variation of Distances between Four Coaxial Dielectric Disks. Photonics, 8(11), 460. https://doi.org/10.3390/photonics8110460

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Exceptional Points through Variation of Distances between Four Coaxial Dielectric Disks

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