Tunable on chip optofluidic laser

Abstract

A chip scale tunable laser in the visible spectral band is realized by generating a periodic droplet array inside a microfluidic channel. Combined with a gain medium within the droplets, the periodic structure provides the optical feedback of the laser. By controlling the pressure applied to two separate inlets we can change the period of the droplet array. As a result, the lasing frequency is tuned over a broad spectral range. Using this configuration, we demonstrate wavelength tunability of about 70 nm and lasing threshold of about 15 μJ/mm2.

Direct‐Writing Multifunctional Perovskite Single Crystal Arrays by Inkjet Printing

“…[6d] The reported methods can induce one kind of single crystal formation, but they all need prefabricated patterns, which are complex and would limit their scalability. Thus, it is still a great challenge to rapidly integrate various classes of perovskite single crystals into one chip and directly grow different kinds of perovskite crystals into precise patterns, which is of great meaning for high‐performance semiconductor optoelectronic devices such as band‐tunable photodetector, multiple wavelength laser array, and tandem solar cell . As known, inkjet printing technology can make precise patterns using various materials, which has many advantages such as free of mask and microfabrication, flexible operation, and materials integration .…”

Optofluidic distributed feedback lasers with evanescent pumping: Reduced threshold and angular dispersion analysis

“…12 However, such devices require the use of buffers or solvents with high refractive index, such as ethylene glycol or dimethyl sulfoxide (DMSO). [5][6][7]13,14 High refractive index solvents are usually not biocompatible, which limits the application of optofluidic DFB lasers in biosensing. 15 The study of stimulated emission from biological materials has also gained substantial interest over the last two decades, from random lasing in dye stained animal tissue 16 to the development of single cell biological lasers.…”

“…3 and DNA 4 lasers for bio applications and single mode optofluidic DFB lasers. [5][6][7] Especially, optofluidic DFB lasers have attracted substantial attention due to their potential for cost-effective lab-on-a-chip spectroscopy applications. 8,9 Compared with whispering gallery mode resonators and Fabry-P erot like cavities, the DFB structure is particularly well suited for achieving narrow bandwidth single-mode lasing operation.…”

Nonlinear, tunable, and active optical metasurface with liquid film

“…Prominent examples include light-induced collective orientation of liquid crystal molecules [31], pressure induced control of lasing frequency in a 1D array of droplets [32], magnetic induced ferrofluid-based hyperbolic metamaterial [33], and chemical composition induced changes enabling lasing frequency tuning in 1D systems [34] and in 2D photonic crystals [35]. Furthermore, recent studies introduced a novel interaction between SPPs and a thin liquid dielectric (TLD) film due to geometrical changes of the gas-fluid (or fluid-fluid) interface, facilitated arXiv:1912.06179v1 [physics.optics] 12 Dec 2019 by the thermocapillary (TC) effect; theoretical study of self-induced focusing and defocusing effects of propagating SPPs due to nonlocal interaction [36] (where refractive index changes extend beyond the regions of maximal optical intensity) as well as formation of an optical liquid lattice of a fixed square symmetry, and experimental demonstration of TC-assisted optical tuning of surface plasmon resonance coupling angle [37].…”