Abstract
Nanoscale coherent light sources offer potentially ultrafast modulation speeds, which could be utilized for novel sensors and optical switches. Plasmonic periodic structures combined with organic gain materials have emerged as promising candidates for such nanolasers. Their plasmonic component provides high intensity and ultrafast nanoscale-confined electric fields, while organic gain materials offer fabrication flexibility and a low acquisition cost. Despite reports on lasing in plasmonic arrays, lasing dynamics in these structures have not been experimentally studied yet. Here we demonstrate, for the first time, an organic dye nanoparticle-array laser with more than a 100 GHz modulation bandwidth. We show that the lasing modulation speed can be tuned by the array parameters. Accelerated dynamics is observed for plasmonic lasing modes at the blue side of the dye emission.
Highlights
Nanoscale coherent light sources offer potentially ultrafast modulation speeds, which could be utilized for novel sensors and optical switches
Surface lattice resonances (SLRs) are collective optical modes arising from radiative coupling of localized surface plasmon resonances with diffractive orders (DOs) in metal nanoparticle arrays
We present the first extensive investigation of ultrafast lasing dynamics in organic nanoparticle-array lasers; it is among the first time-resolved studies realized in all types of nanolasers.[4,22,23]
Summary
The lasing dynamics in the rate-equation model is very sensitive to the lasing mode (or cavity) lifetime, and the shorter lifetime with a shorter period (band-edge in higher energy) leads to faster built-up time and a shorter pulse duration. Note that for the FDTD simulations, we present the dynamics following a single pump pulse, not pump−probe experiment simulations as for the rate-equation simulations This is because the main purpose of the FDTD simulations is to demonstrate the highly inhomogeneous and nontrivial spatial dependence of the fields during the lasing action. Additional figures of experimental setup, double-pump resolution, band-edge mode lifetime, lasing power dependence and dynamics for y-polarized dipoles, spontaneous emission lifetime, electric filed magnitude, SEM image, power dependence spectra, power dependence of IR-140, directionality at deep-blue region, sensitivity analysis of the rate-equation model, and rateequation simulation at 8Pth as well as methods for rateequation and FTDT modeling (PDF).
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