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

TL;DR

This paper introduces a novel rainbow trapping method using optical Tamm modes in a one-dimensional chirped photonic crystal, achieving longer electromagnetic field lifetimes exceeding 1 ps for broadband light trapping.

Contribution

The study demonstrates a new rainbow trapping approach utilizing multiple optical Tamm modes in a chirped photonic crystal with enhanced lifetime and spatial localization.

Findings

Achieved electromagnetic trapping lifetimes of 3 ps.

Localized modes are spatially separated in the chirped PC.

Group velocities of modes reduced to 0.17c.

Abstract

The phenomenon of trapping broad spectrum of light is known as `rainbow trapping' and achieved using all-dielectric, hybrid metallo-dielectric or all-metallic configurations. In the latter cases, unavoidable ohmic losses result in sub-picosecond trapped-mode lifetimes. For all practical purposes, novel strategies are required to be devised for trapping and subsequently, releasing broadband electromagnetic (em) field with lifetime > 1 ps. We present a rainbow trapping configuration using the excitation of multiple optical Tamm (OT) modes in an one-dimensional chirped photonic crystal (PC) designed for adiabatically coupling counter-propagating modes. In the geometry, the multiple pi phase jumps enable excitation of OT modes when a thin plasmon-active metal is placed adjacent to the terminating layer of chirped-PC (CPC). The strongly localized OT resonances are spatially separated in the chirped-PC geometry and their group-velocities reduce to as low as 0.17c. The time-domain simulations elucidate localization takes place in the dielectric sections of CPC which manifest into lifetimes 3 ps.