Abstract: The invention provides a close space annealing method and a method for preparing a perovskite film or a solar cell. The method includes: placing a substrate coated with the perovskite precursor film on a hot plate, the hot plate being in direct contact with the back face of the substrate; controlling the evaporated amount and residual amount of the solvent in the perovskite precursor film by controlling the temperature of the hot plate and the heating duration, so that the perovskite materials are crystallized into perovskite grains to form a perovskite intermediate-phase film; placing the perovskite intermediate-phase film on the permeable membrane with the back face of the substrate facing upward, continuing with heating, so that adjacent perovskite grains merge with each other; and raising the temperature of the hot plate and continuing with heating so that the perovskite grains form a perovskite light-absorbing layer.

Abstract: Embodiments of the present disclosure relate to a D-amino acid oxidase mutant and application in preparing L-glufosinate thereof. The D-amino acid oxidase mutant has an amino acid substitution at at least one of position 62 and position 226 of an amino acid sequence of the D-amino acid oxidase mutant when compared to an amino acid sequence of a D-amino acid oxidase as set forth in SEQ ID NO. 1, the position 62 and position 226 being defined with reference to SEQ ID NO. 1, and the amino acid sequence of the D-amino acid oxidase mutant having at least 90% identity to SEQ ID NO. 1.

Abstract: A phase coder-decoder for quantum key distribution including a beam splitter, two reflecting devices with an orthogonal rotation of polarization optically coupled with the beam splitter via two arms, and a phase modulator provided on one of the two arms. The reflecting devices including a polarization beam splitter having an input and two output ports, and coupled to a corresponding arm via the input port, the output ports optically coupled to each other via a polarization maintaining optical fiber twisted by 90 degrees such that optical pulses output by the output ports are coupled to an axis of the polarization maintaining optical fiber for transmission. The phase coder-decoder is configured to stably perform interference on input optical pulses with an arbitrary polarization state for coding and decoding purpose.

Abstract: A phase decoding method and apparatus for quantum key distribution based on reflection with an orthogonal rotation of polarization, and a corresponding system. The method comprises: splitting an input optical pulse of an arbitrary polarization state into two optical pulses by a beam splitter; and, transmitting the two optical pulses respectively along two optical paths, with a relative time delay applied to them, and then reflecting them back to the beam splitter respectively by two reflecting devices to be combined and output by the beam splitter. A phase modulation is performed on at least one of the two optical pulses according to a quantum key distribution protocol, and two orthogonal polarization states of the optical pulse are reflected with an orthogonal rotation of polarization, so that each orthogonal polarization state of the optical pulse, after being reflected by the corresponding reflecting device, is transformed to a polarization state orthogonal thereto.

Abstract: The present invention discloses a light-operated adjustable terahertz wave attenuator. The attenuator includes a silicon base-silicon base-vanadium oxide thin film, a laser emitter and a spherical collimating lens, wherein the silicon based-vanadium dioxide thin film is vertical to a terahertz beam direction, the laser emitter is arranged on one side of the silicon based-vanadium dioxide thin film, the laser emitter is connected with the collimator, the laser emitted from the laser emitter is emitted from the collimator and irradiates on a film surface of the silicon based-vanadium oxide thin film, and the spots of the laser irradiating on the film surface of the silicon based-vanadium oxide thin film completely cover the transmitted terahertz wave spots. The present invention further discloses a use method of the light-operated adjustable terahertz wave attenuator.

Abstract: The present invention discloses a light-operated adjustable terahertz wave attenuator. The attenuator includes a silicon base-silicon base-vanadium oxide thin film, a laser emitter and a spherical collimating lens, wherein the silicon based-vanadium dioxide thin film is vertical to a terahertz beam direction, the laser emitter is arranged on one side of the silicon based-vanadium dioxide thin film, the laser emitter is connected with the collimator, the laser emitted from the laser emitter is emitted from the collimator and irradiates on a film surface of the silicon based-vanadium oxide thin film, and the spots of the laser irradiating on the film surface of the silicon based-vanadium oxide thin film completely cover the transmitted terahertz wave spots. The present invention further discloses a use method of the light-operated adjustable terahertz wave attenuator.