Single-excitation dual-color coherent lasing by tuning resonance energy transfer processes in porous structured nanowires

Abstract

Single-excitation dual-color coherent lasing was achieved in a mixed random system of a binary dye and the suspension of gold-silver porous nanowires with plenty of nanogaps. This greatly enhanced the local electromagnetic field in the visible range and guaranteed a low threshold and high Q factor (>10 000) operator for simultaneous dual-color lasing. By tuning the resonance energy transfer process in the stimulated emission, triple output modes (single chartreuse lasing, chartreuse and red dual-color lasing, and single red coherent lasing) were easily obtained. This triple-mode coherent random lasing introduces a new approach to designing multi-functional micro-optoelectronic devices for multi-color speckle-free imaging and interference.

Broadband plasmonic silver nanoflowers for high-performance random lasing covering visible region

“…There are more spikes that emerged in the spectra as the pump power densities further increase, as shown in Figure 5A (blue and olive curves). The appearance of sharp spikes indicates building the coherent feedback in random system, resulting from the strong feedback and large enhancement of the local electromagnetic field induced by the nanogaps within Ag NFs [20][21][22]. The probability of coherent random lasing [37,38], defined as the ratio of the number of spectra with coherent modes to the total number of spectra captured, is used to determine the threshold of coherent random lasing as shown in Figure 5B.…”

“…For example, Popov et al [14] found that gold nanoparticles enhanced the gain in random laser system containing dyes and gold nanoparticles. To achieve random lasing with lower threshold and multicolor emissions, nanogap-based random lasing was proposed by choosing the gold-silver (Au-Ag) bimetallic porous nanowires with abundant nanogaps that provide strong feedback or gain channels for coherent lasing from dye molecules [20,21]. Based on the strong confinement characteristic of the nanogaps, Au-Ag bimetallic nanowire-based random lasers operate at a low threshold and have high Q-factors in a wide visible spectral range [22].…”

Resonance energy transfer-assisted random lasing in light-harvesting bio-antenna enhanced with a plasmonic local field

“…[1][2][3] Demonstrations of random lasing have been reported with both pulsed and continuous-wave (CW) pumping. [4][5][6][7][8][9][10][11][12] Generally, long-wavelength or near-infrared (NIR) (>650 nm) uorescent dyes have high penetration properties in tissue. [13][14][15] Therefore, they can be fruitfully used for biomedical and biophotonic applications, such as in surgical therapy treatments, cancer diagnostics, etc.…”

“…18,19 Such optically active biodegradable organic dyes provide a unique possibility for RL generation in combination with metal/semiconductor nanoparticles (NPs) as the scattering particles. [4][5][6][21][22][23] Traditionally, it has been reported that, RL generation is dependent on multiple scattering of light in a random gain medium. The presence of the strong electric eld of metal NPs may enhance these scattering properties, and may also modify the transition rates of nearby dye molecules.…”

“…The presence of the strong electric eld of metal NPs may enhance these scattering properties, and may also modify the transition rates of nearby dye molecules. [4][5][6] Random lasing has been obtained in several materials, such as metal/semiconductor NPs, human tissue, liquid crystals, uorescent polymers, commercial dyes, etc. [4][5][6][7][21][22][23] At present, there is a huge demand for multi-coloured random laser sources in the medical and optoelectronics sectors.…”