4 results about "Chirality" patented technology

The application discloses an anti-interface rough scattering quantum cascade laser active region and a preparation method thereof. The application forms a topological interface state protected by chiral symmetry as a lasing upper energy level at the butt joint interface between a first superlattice region and a second superlattice region, the wave function of the topological interface state is strictly zero in the thick barrier center and the interface, thereby the non-radiation loss caused by the interface roughness scattering is inhibited from the root, and the upper energy level carrier lifetime is significantly prolonged. Based on this, the threshold current density of the quantum cascade laser is greatly reduced, and high-efficiency lasing of 10 μm wavelength can be realized at room temperature. Meanwhile, a mixed epitaxy process combining molecular beam epitaxy and metal organic chemical vapor deposition is adopted, the nanometer precision energy band design of the core active region is ensured, and the efficient growth of the thick film waveguide layer is realized, which is beneficial to the practicalization and large-scale preparation of the device.

The application belongs to the technical field of light emitting diodes, and discloses a high-polarization circularly polarized light emitting diode, a preparation method and application thereof. The circularly polarized light emitting diode comprises, from bottom to top, a bottom reflective electrode arranged on the surface of a first substrate, a light emitting unit, a top transparent electrode, and a Bragg reflection layer. The material for preparing the Bragg reflection layer is cholesteric liquid crystal. The bottom reflective electrode and the Bragg reflection layer form a Bragg-mirror reflection microcavity structure, and the Bragg reflection layer selectively reflects and outputs circularly polarized light with the same chirality. The Bragg-mirror reflection microcavity is used for chirality selection, and the microcavity structure reverses the optical rotation of light with non-target optical rotation, thereby breaking through the problem of serious light loss of a traditional external polarizer. The microcavity structure utilizes the Bragg-mirror reflection optical microcavity polarization regulation mechanism, so that the light emitting diode does not depend on the intrinsic chirality, spin polarization or special orientation of the light emitting material, and can be applied to various light emitting systems.

Systems and methods for separating chiral objects in a mixed solution are provided. In some aspects, a method includes providing a separation device with a mixed solution of chiral objects comprising a first species of chiral objects and a second species of chiral objects. The method also includes directing an electromagnetic system positioned about the separation device to generate a time-dependent electric field excitation configured to selectively control a propulsion of chiral objects in the mixed solution to spatially separate the first species of chiral objects from the second species of chiral objects inside the separation device. The method further includes collecting spatially separated chiral objects from the separation device.

A spin Hall shift of light-based chirality parameter detection method and system. The method comprises: acquiring the dielectric constant, the magnetic permeability and the radius of chiral nanoparticles under test; on the basis of the dielectric constant, the magnetic permeability and the radius, determining spin Hall shifts of light of chiral nanoparticles having different chirality parameters under duality symmetry conditions, and obtaining a mapping relationship between the spin Hall shifts of light and the different chirality parameters; using circularly polarized light to irradiate the chiral nanoparticles under test to generate a spin Hall effect of light; and under the spin Hall effect of light, adjusting the wavelength of incident light until duality symmetry is satisfied, and obtaining an optimal spin Hall shift of light; and on the basis of the optimal spin Hall shift of light and the mapping relationship, determining a chirality parameter of the chiral nanoparticles under test. The method effectively avoids the occurrence of a destructive effect, improves the capability to characterize near-field chiral information, and enables near-field chiral features to be captured and parsed more accurately and comprehensively.