On May 10th, the State Key Laboratory of Laser Physics of Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, cooperated with Chongqing University to make new progress in the field of micro-laser pointer research. The related research results are published in the international journal ACS Nano under the title of Robust Subwavelength Single-Mode Perovskite Nanocuboid Laser [ACS Nano 2018, DOI: 10.1021/acsnano. 8b02143]. In this work, researchers first realized high-quality, low-threshold, narrow-bandwidth, temperature-stable, picosecond pulse-width single-mode laser output in a single perovskite nanocube structure with three-dimensional dimensions smaller than the emission wavelength. This is the smallest known perovskite nanolaser currently known and is the smallest laser based on a conventional cavity structure. The research results will promote the further development of micro-lasers to miniaturization and short pulses.
Nano-scale laser pointer has great application prospects in many fields such as optoelectronic integration, high-density data storage, on-chip interaction, thin film display, high-resolution bio-imaging and sensing, but the optical field is limited to the traditional resonator structure of sub-wavelength scale. Type lasers have been rarely reported. In this study, researchers have successfully prepared high-quality three-dimensional sub-wavelength perovskite cubic nanostructures based on a modified low-temperature solution method. The end face is smooth and structurally regular (Fig. 1), so that it can As a laser gain medium, high-inverse effects can be achieved at the interface to form an ideal Fabry-Perot resonator. Using a micro-optical system to study a single cube resonator, a high-gain, low-threshold, narrow-bandwidth up-conversion picosecond single-mode laser output is obtained at room temperature (Figure 2). The volume of the entire laser is only ~0. .49λ3. Using the ultra-fast pump detection platform developed by the front end of Shanghai Super Ultra-short Laser Experiment Device (SULF), the laser gain mechanism of the nano-laser is deeply analyzed (Fig. 3) to clarify its intrinsic physical mechanism; at the same time, its temperature dependence Studies on luminescence properties show that the luminescence peak of the nanolaser is not sensitive to temperature and has very good temperature stability.
The research was supported by the Chinese Academy of Sciences Class B Pilot Project, the National Key R&D Program – the Intergovernmental International Science and Technology Innovation Cooperation Special Project, the Chinese Academy of Sciences “Hundred Talents Program”, and the National Natural Science Foundation.