Associate Professor Zhang Qinglin from Hunan University made a series of important progresses in the research of nanometer lasers

The recent development of silicon-based integrated photonics technology, using photons instead of traditional electrons as the carrier of information transfer, can greatly reduce the energy consumption of the information processing system and improve the speed and capacity of information transfer, bringing about the performance improvement of traditional integrated circuits Hope However, an important disadvantage of silicon-based integrated photonics technology is that it is difficult to realize an integrated nano-light source, which makes the size of the system too large to realize high-density and highly integrated photonic chip technology. The development of micro-nano-scale integrated light source - nano-laser, to solve the integrated photon technology research is the bottleneck of the light source is essential.

The integrated optoelectronic team led by Prof. Pan Anlun, professor of Physics and Microelectronics Science of Hunan University, has long been devoted to the research and development of integrated photonic technology and has developed new ideas for integrated photonic chip through the controllable fabrication and assembly of functional nanostructures. In many aspects Achieved a breakthrough in international impact. In recent years, Associate Professor Zhang Qinglin, a core member of the team, has been focusing on the research and development of new type of nano-laser. Recently, he has made a series of important original achievements in the research of nano-laser integration, low threshold single-mode laser and nanometer laser mechanism.

Results 1: Aiming at the difficult technical bottleneck of nano-laser integration, through the physical simulation and experimental verification, the successful realization of the nano-laser array integrated in a nano-scale nano-band, providing a new design ideas and efficient integration of nano- Method, the nano-laser array in photonic integrated circuits, signal processing, high-throughput biosensing, display and other fields have potential applications. This result was recently published in Laser & Photonics Reviews 2016, 10, 458-464, (IF = 7.846), the top issue in physics and photonics.

(A) - (c) Structure topography of the nano-laser array, (d) Simulation results of the light field distribution of the nano-laser, (e) Laser emission process map and corresponding microscopic optical image of the nano-laser array.

Results 2: Aiming at the existing high threshold and non-uniform mode of nano-laser, a set of process technology was developed to integrate the semiconductor nanostructures and the distributed dielectric Bragg reflector microcavities, which effectively overcome the shortcomings of light in nanostructured microcavities The waveguide has been successfully used to amplify the light at the nanoscale gain medium, resulting in the advantages of single mode, low threshold (8 μJ / cm2) and high polarization (97.4%). This result was recently published in Nano Energy 2016, 30, 481-487 (IF = 11.553), the top issue in the field of nano-energy.

Caption: (a) Structure diagram of semiconducting nanostructures in medium DBR microcavity. (b) A partially developed schematic of the microcavity. Arrows indicate optical resonance and amplification. (c) Cross-sectional SEM image of semiconductor nanostructures in DBR microcavities. (d) Fluorescence-dependent fluorescence spectroscopy and microluminescence images.

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