On chip random lasing performance of the acceptor dye in a specially designed linear and zig zag array of microdroplets with intrinsic disorder

Abstract

We demonstrate high-quality on chip random lasing of the acceptor dye using a specially designed dynamic linear array of microdroplets with unconventional shapes that do not support the whispering gallery modes. The intrinsic disorder in the droplet array consequent to its dynamic nature is utilized in achieving the randomness in the lasing emission without deliberately adding the disorder as in ordinary random laser systems. The novelty of the generated structure is illustrated by comparing its emission characteristics with two other arrays made of microspheres and microtriangular droplets arranged in a zig zag fashion. We show that only the linear array of microdroplets supports lasing in the acceptor emission. The design of the array structure allows to further reduce the lasing threshold drastically either by incorporating the radiative energy transfer or by tuning the number of acceptor dye molecules. The highly directional, well-controlled, and intense emission of weakly emitting dye generated on chip without the aid of conventional methods opens up a new scheme of random lasing generation mediated by microdroplets.

Probing Structural Correlated Disorder with Photonic Transport

“…For example, the long-range order always dominates in quasiperiodic materials, , while the long-range order is gradually destroyed in amorphous materials, , and both long-range and short-range orders are lacking in completely random materials as increasing disorder. , Disorders in materials with long-range and short-range orders are two kinds of correlated disorder. Generally, short-range order related to local connectivity of the lattice has an impact on electron states in alloys, electrical resistance, and the spin Seebeck effect, − whereas long-range order related to translation correlations affects density of states (DOS) and Bragg peaks. − The study of localization induced by uncorrelated disorder has been widely applied in the quantum transport, single-mode transmission and random lasing generation. − …”

Engineering of Solid-State Random Lasing in Nanoporous Anodic Alumina Photonic Crystals

“…RLs provide operational simplicity, integrability with existing fabrication technologies for miniaturization, reliability, direct laser-level intensity, and broad angular lasing . As such, these light-emitting devices are currently used across a variety of photonic technologies such as optical barcoding, optomicrofluidics, sensors and biosensors, high-resolution bioimaging, on-chip spectroscopy, and time-resolved microscopy and spectroscopy …”

“…7 RLs provide operational simplicity, integrability with existing fabrication technologies for miniaturization, reliability, direct laser-level intensity, and broad angular lasing. 8 As such, these light-emitting devices are currently used across a variety of photonic technologies such as optical barcoding, 9 optomicrofluidics, 10 sensors and biosensors, 11 high-resolution bioimaging, 12 on-chip spectroscopy, 13 and time-resolved microscopy and spectroscopy. 14 To date, distinct forms of RLs with scattering-based distributed feedback have been realized by integrating a range of diffusive elements and gain media such as colloidal solutions of scattering particles and organic dyes, 15 living tissue, 16 semiconductor powders, 17 doped optical fibers, 18 composite porous materials, 19 liquid crystals, 20 etched semiconductors, 21 and polymers.…”

Tuning Multi-wavelength Lasing in Rhodamine 640/Methylene Blue/Ag NWs Random Lasers

“…To overcome this, we utilize the resonance energy transfer (RET) process between Rhodamine 640 and methylene blue. The absorption band of methylene blue partially overlaps with the emission band of Rhodamine 640, and the average distance between the donor and acceptor should not be smaller than the Förster distance to achieve moderate energy transfer e ciency [11,12].…”