Peking University has made important progress in the field of precise integration of on-chip micro-nano lasers

[ China Instrument Network Instrument R&D ] With the advent of the information age, the explosive growth of information volume, and the use of traditional integrated circuits to process large amounts of data have become increasingly stretched. Photonic integrated circuits and photonic chips have the advantages of low power consumption, high speed, and large bandwidth, which is a feasible solution for future optical information processing systems. Photonic chips generally include three main parts: on-chip light source, signal processing and signal detection. Accurate and controllable integration of micro-nano photonic devices with different materials, different structures and different functions on a single chip is one of the key technologies for implementing photonic chips.

Accurate, parallel, and non-destructive integration of plasmonic waveguides on collimated on-chip colloidal quantum dot microdisk lasers and silver nanowires.

Recently, the “Extreme Optical Innovation Research Team” of Peking University has developed a high-precision dark-field optical imaging and positioning technology (position uncertainty is only 21 nm), and combined with the electron beam engraved technology, the on-chip quantum dot micro-disk laser has been realized. Accurate, parallel, and lossless integration of plasmonic waveguides on silver nanowires. This microdisk-silver nanowire composite structure has the advantages of a dielectric laser and a surface plasmon waveguide at the same time. Therefore, it has not only the low threshold and narrow linewidth characteristics of the dielectric laser, but also the deep subwavelength field of the surface plasmon waveguide. Tethering characteristics.

Based on this flexible and controllable preparation method, they realized various forms of precise and controllable integration between on-chip microdisk lasers and surface plasmon waveguides, including tangential integration, radial integration, and complex integration, as well as quantum dots. Without any processing damage; further, through the simultaneous integration of multiple on-chip microdisk lasers and multiple silver nanowire surface plasmon waveguides, they obtained multimode, monochromatic, and bichromatic single mode deep subwavelengths (0.008λ2). Coherent output light source.

These high performance deep sub-wavelength coherent output light sources can be easily coupled and distributed to other deep sub-wavelength surface plasmon photonic devices and circuits. Therefore, this flexible and controllable precise integration method has important applications in photonic-surface plasmon-based composite photonic circuits with high integration density, and this method can be extended to other materials and other functions of micro-nano photonic device integration In the future, it provides a feasible solution for the realization of photonic chips in the future.

This work was published in Advanced Materials (Advanced Materials 2018, 30, 1706546) in May 2018 and is reported in the form of a Frontispiece. The author's first author is Rong Kexiu, a Ph.D. student in Peking University’s School of Physics, and Chen Jianjun’s researcher is the author of the correspondence. The research work was supported by the National Natural Science Foundation of China, the Ministry of Science and Technology, the State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, the Collaborative Innovation Center of Quantum Physics, and the Collaborative Innovation Center for Extreme Optics.

(Original Title: Peking University Has Made Important Progress in the Field of Precision Integration of On-Chip Micro-Nano Lasers)