Infrared rainbow trapping via optical Tamm modes in an one-dimensional dielectric chirped photonic crystals

Abstract

The phenomenon of trapping a broad spectrum of light is known as “rainbow trapping” and is achieved by using all-dielectric, hybrid metallo-dielectric, or all-metallic configurations. The latter architectures allow strong confinement but exhibit very high ohmic losses. This results in practical lifetimes of trapped modes to less than 1 ps. Therefore, novel strategies are required to be devised for trapping and, subsequently, releasing broadband electromagnetic field with lifetime > 1 p s . We present a rainbow trapping configuration using the excitation of multiple optical Tamm (OT) modes in an one-dimensional chirped photonic crystal (CPC) designed for adiabatically coupling counterpropagating modes. In the geometry, the backscattered phase undergoes multiple discontinuities ( = π ), which enables excitation of many OT modes in the presence of a thin plasmon-active metal, which is placed adjacent to the terminating layer of CPC. All the OT modes are spatially separated in the CPC, and the strong modal confinement manifests into group velocities as low as 0.17 c . The time-domain simulations depict mode-localization in the dielectric sections of CPC, which manifest into lifetimes ∼ 3 p s .

Dual-Channel Underwater Acoustic Topological Rainbow Trapping Based on Synthetic Dimension

“…Rainbow trapping, which separates and traps waves of different frequencies at different spatial positions, is advantageous for applications that require temporary energy storage [20,21], augmented energy-matter interaction [22,23], and efficient frequency routing in classical systems [24][25][26]. Inspired by rainbow trapping, which originated from studies in electromagnetic waves [20,[27][28][29][30], research has also been conducted on trapping acoustic waves. Zhu et al, achieved rainbow trapping of acoustic waves through spatial modulation of sound velocity in a new class of anisotropic metamaterials [31].…”

Особенности Поглощения Света В Чирпированных Одномерных Фотонных Кристаллах

“…В чирпированных ФК имеет место так называемый эффект радужной ловушки электромагнитной волны [22][23][24][25]. Радужная ловушка заключается в сильной спектрально зависимой локализации электромагнитных волн в определенных пространственных позициях в ФК.…”

“…Радужные ловушки привлекают большое внимание благодаря своим широким потенциальным применениям: в оптических буферах, оптической памяти, обработке оптических данных, оптических фильтрах, сортировке и в хранении энергии, усилении взаимодействия свет−материя и т. д. [22][23][24][25][26][27]. Чирпированные ФК применяются в системах структурного окрашивания [28][29][30][31].…”

Peculiarities of light absorption in chirped one-dimensional photonic crystals

“…In chirped PCs, the so-called electromagnetic wave rainbow trapping effect [22][23][24][25] takes place. The rainbow trap consists in a strong spectrally dependent localization of electromagnetic waves in certain spatial positions in the PCs.…”

“…Rainbow traps command great attention due to their wide potential applications: in optical buffers, optical memory, optical data processing, optical filters, energy sorting and storage, enhancement of light−matter interaction etc. [22][23][24][25][26][27]. Chirped PCs are used in structural tinting-method systems [28?31].…”