Dual-color plasmonic random lasers for speckle-free imaging

Abstract

A dual-color plasmonic random laser under single-excitation is achieved in an ultrathin membrane doped with binary quantum dots and gold nanorods. The gold nanorods tune the luminescence lifetime and emission efficiency of quantum dots. Under single excitation, low-threshold random lasing is observed. Green random lasing at 547 nm is 'turned on' and red random lasing at 630 nm is greatly enhanced by the transversal and longitudinal surface plasmon resonance of the gold nanorods, respectively. Speckle-free color imaging is achieved by using the proposed dual-color random laser source. These properties would facilitate the development of random lasers in fields of illumination and imaging.

Transferable microfiber laser arrays for high-sensitivity thermal sensing

“…1c) exhibit an extinction spectrum of two distinct peaks at around 530 nm and 630 nm (Fig. 1d), representing the transversal and longitudinal surface plasmon resonant mode, 37 respectively. The extinction peaks show considerable overlap with the absorbance and PL spectrum of RhB, contributing to an enhancement in the excitation efficiency and emission of the gain material owing to the localized surface plasmonic resonance (LSPR) mechanism.…”

Plasmonic random lasing and amplified spontaneous emission from donor–acceptor–donor dyes covered biocompatible silk fibroin film

“…Using the best fit of eqn ( 2 3.3 Plasmonic random lasing on the side of the DC-SF/AgNPs film LSPR, a spectacular physical effect, has been induced through charge density oscillation around the surface of metallic nanoparticles (MNPs). 7,43,44 When the frequency of light matches the resonance of the surface plasmon, the LSPR effect will cause strong electromagnetic field confinement or light trapping on MNPs. 45 Theoretically, the oscillation frequency of the surface plasmon resonance (SPR) is related to the size and shape of the metallic nano-structure.…”

Suppression of Randomness in Electrically Pumped Random Lasing from a ZnO Film-Based Light-Emitting Device on Silicon

“…Since Cao et al reported the optically pumped random lasing (RL) from a ZnO polycrystalline film, a lot of efforts have been expended on the RL from various ZnO materials. − Nevertheless, the electrically pumped RL from the ZnO polycrystalline film was not realized in a report from Ma et al until 2007, in which a metal–insulator–semiconductor (MIS) structure in the form of Au/SiO x ( x < 2)/ZnO was adopted to form a light-emitting device (LED) on a silicon substrate. Afterward, other several research groups achieved the electrically pumped RL from the ZnO polycrystalline film by means of different device structures. − Although the electrically pumped RL may find applications such as speckle-free imaging, display, and optical encryption, − it suffers from multiple-mode operation in most practical applications . Therefore, to suppress the randomness in the electrically pumped RL is worthy to be developed.…”