Sign in to use this feature.

Years

Between: -

Subjects

Journals

Article Types

Countries / Regions

Search Results (1)

Search Parameters:
Keywords = rainbow tapping

Order results
Result details
Results per page
Select all
Export citation of selected articles as:
15 pages, 5461 KiB  
Article
Topological Rainbow Trapping with Expanded Bandwidth in Valley Photonic Crystals
by Sayed El. Soliman, Israa Abood, Naglaa Abdel All and Chii-Chang Chen
Photonics 2025, 12(5), 487; https://doi.org/10.3390/photonics12050487 - 14 May 2025
Viewed by 941
Abstract
We introduce a novel approach to achieve broadband rainbow trapping in a 2D photonic crystal (PC) platform. By exploiting the concept of valley PCs, we engineer a structure that supports robust topological edge states. A carefully designed rotational angle gradient along the edge [...] Read more.
We introduce a novel approach to achieve broadband rainbow trapping in a 2D photonic crystal (PC) platform. By exploiting the concept of valley PCs, we engineer a structure that supports robust topological edge states. A carefully designed rotational angle gradient along the edge state path induces frequency-dependent light localization, forming a topological rainbow with a significantly expanded bandwidth. This phenomenon of topological rainbow trapping is attributed to the interplay between valley-dependent topological edge states and the engineered rotational angle gradient. To further enhance light localization and broaden the trapping spectrum, we incorporate a graded radius profile in the bottom row of dielectric columns. Through a combination of rotational angle modulation and radius grading, we successfully realize broadband rainbow trapping with enhanced light localization. Our findings reveal a broad trapping bandwidth spanning from 0.8314c/a to 0.9205c/a, showcasing the potential of this approach for applications in optical frequency filtering, sensing, and information processing. Full article
(This article belongs to the Special Issue Photonics Metamaterials: Processing and Applications)
Show Figures

Figure 1

Back to TopTop