Photon localization laser

TL;DR

This paper demonstrates low-threshold random lasing enabled by photon localization in layered media, overcoming previous barriers related to excitation region limitations in diffusive random lasers.

Contribution

It introduces a novel mechanism utilizing photon localization to achieve low-threshold lasing in layered random media.

Findings

Resonant excitation of localized modes at the pump wavelength.

Lasing occurs in deep, localized regions within the sample.

Overcomes threshold limitations of diffusive random lasers.

Abstract

We demonstrate low-threshold random lasing in random amplifying layered medium via photon localization. Lasing is facilitated by resonant excitation of localized modes at the pump laser wavelength, which are peaked deep within the sample with greatly enhanced intensity. Emission occurs into long-lived localized modes overlapping the localized gain region. This mechanism overcomes a fundamental barrier to reducing lasing thresholds in diffusive random lasers, in which multiple scattering restricts the excitation region to the proximity of the sample surface.