Member of Chinese academy of sciences, China university of science and technology, professor guang-can guo leadership of the Chinese academy of sciences key laboratory in cavity quantum optical mechanical progress was made in the research field. The laboratory and postdoctoral Zou Changling chun-hua dong team for the first time in the echo wall patterns observed the micro cavity based on cavity light force system of mutual Yi Guangxue features, got the all-optical control of reciprocity microcavity devices. The results on August 22, published online in the journal nature photonics.
Has two-way transmission of light in a general medium reciprocity, yet in a photonic integrated circuits, one-way light control is classical and quantum information processing in one of the most basic requirement, so full of light control of optical isolator, circulator and the reciprocity phase shifter has always been a hotspot of research on optical chips, these optical devices are based on the reciprocity of optical properties. Generally the reciprocal of the device is on the basis of the characteristics of magneto-optic material, but this material often require strong magnetic field, the integration of its small size, and thus can be integrated QuanGuangFei reciprocity devices are still facing a great challenge.
The research using the echo wall pattern common light force interaction in the microcavity, different is its optical model are two degenerate clockwise and counterclockwise traveling wave mode, the two degenerate optical model has exactly the opposite of orbital angular momentum. Under the condition of satisfy the matching of angular momentum, only when coupled to the same drive light and signal light optical mode, the driver can stimulate signal photons and phonons coherent light conversion, thus caused the light propagation of reciprocity. On this basis, the research group has realized the one-way drive caused by light force induced transparency and amplification of reciprocal phenomenon, achieved up to 40 degrees of reciprocity phase shift, which is to achieve the basis of optical isolator, circulator. The light induced force system of reciprocity can be spread by each driver light, at the same time stimulate clockwise and counterclockwise direction of traveling wave mode to regulate, thereby achieving coherence transformation of the two optical mode, this feature can also be used for tunable narrow-band reflector. The experimental study of reciprocity mechanism has universality, can be extended to any traveling wave model system with mechanical vibration, realize integrated microcavity chip components, even single photon level of optical isolator. In addition, the research of china-africa reciprocal characteristics of the phase shift can also be used to study the topological properties of photons, edge of chiral and protect the topology.
Results of this research was the team last year about the brillouin non reciprocal characteristics research [Nature Communications 6, 6193 (2015)] is outspread, expand the applicable to the reciprocal device cavity light force system, the working wavelength even extended to the whole wavelength microwave, especially in the system of quantum ground state, isolate the light of the single photon level possible, this will in future composite quantum networks play an important role.
The study by the ministry of science and technology, Chinese academy of sciences, national natural science foundation, quantum information and quantum frontier collaborative innovation center and China university of science and technology trend of important projects to foster fund support.
