Slow light by dual-periodic self-similar dielectric multilayered films

Ropač, Peter (author), Mur, Urban (author), Ravnik, Miha (author)

We demonstrate the emergence of slow-light in dual-periodic dielectric one-dimensional photonic crystals with self-similar features at different length scales. Specifically, using numerical modelling, we explore self-similar photonic crystals which are formed as effective combinations of dual periodic stacks of dielectric layers and show that the emergent photonic band diagram can be widely designed by different structural parameters. The width and the position of bandgaps can be designed to work over a wide range of bands and frequencies. The proposed design also leads to the emergence of flat bands and major slow-light regimes, with possible group refractive index of light as large as 103 and in a range of bands.

• Language: English
• Keywords: optics, photonics, photonic crystals, self-similarity
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: Str. 22385-22395
• Numbering: Vol. 31, no. 14
• PID: 20.500.12556/RUL-182378
• UDC: 535:538.9
• ISSN on article: 1094-4087
• DOI: 10.1364/OE.493703
• COBISS.SI-ID: 156570371
• Publication date in RUL: 08.05.2026

Record is a part of a journal

• Title: Optics express
• Shortened title: Opt. express
• Publisher: Optical Society of America
• ISSN: 1094-4087
• COBISS.SI-ID: 8636438

Licences

• License: Other
• Description: Optica Open Access Publishing Agreement

Secondary language

• Language: Slovenian
• Keywords: optika, fotonika, fotonski kristali, samopodobnost