For Tsinghua 110th anniversary, we will open the lab. and show the achievements of the international leading new optoelectronic chips developed by our lab.

(1) Real-time ultra-spectral imaging chips

The world's first real-time spectral imaging chip successfully integrates 155,216 micro spectrometers into a CMOS image sensor, so that a complete spectral image can be obtained by taking a picture at a time. Each micro spectrometer has an independent spectral analysis function, and the central wavelength deviation of monochromatic spectral recovery is less than 0.1nm, and the spectral resolution is 0.8nm.Relevant work has been industrialized, and "Seetrum Technology Co., Ltd." has been established. At present, the company has completed the financing of tens of millions of RMB, and completed the product development of micro spectrometer and water quality monitoring system, which is now being put on the market.

(2) Photonic chips for quantum state generation and manipulation

 A photonic quantum chip is developed to generate, manipulate and detect optical quantum states using silicon photonic integration technology. The comprehensive solution of optical communication band integrated quantum light source has been developed and transformed into product equipment, which has been successfully applied to quantum communication field experiments such as quantum teleportation and quantum entanglement switching. A fully connected quantum key distribution network of 40 users is realized by using silicon optical quantum chips, and the number of quantum key distribution lines supported by a single quantum light source reaches 780, which is the best level in the world.

(3) Generation, detection & manipulation of high-dimensional optical states on chip

Based on the orthogonality between different orders of orbital angular momentum (OAM) beams, a high-speed OAM dynamic encoder/decoder based on silicon optical microrings is proposed innovatively, and a high-speed wireless optical communication solution based on OAM encoding on integrated chip is presented. The dynamic control of pure OAM mode in order -4~4 and superposition state in order -5~5 is realized respectively, which is nearly double the adjustable range of similar chips in the world. Based on this, the matrix operation of high-dimensional optical modes and its research in optical neural network are carried out, and the construction of new experimental beds for optical computation such as the optical Ising machine is initiated firstly.

(4) Free electron light emission chip, device and system

Cherenkov radiation without threshold is observed for the first time. The energy of electrons producing Cherenkov radiation is reduced by more than two orders of magnitude (only 0.25-1.4keV) by artificial hyperbolic metamaterials, and the first free-electron light source integrated on a chip is realized simultaneously. A high-order coherent Smith-Purcell radiated terahertz source with a narrow linewidth (18kHz) of 0.3THz was developed, and the phenomenon of high-order coherent Smith-Purcell radiated terahertz was observed for the first time in a minimized device, and the linewidth of the radiated terahertz source was about 2 orders smaller than that of the existing electronic terahertz source. The free electron radiation light source system has been successfully built, which is used to explore the radiation generated by the interaction between free electrons and micro-nano structures, and to study the control of free electrons on the chip.

Time: 9:00-17:00, April 24th-25th 

Location: Clean room, first floor of Rohm Hall