Tunable unidirectional crossed waveguide distributor based on PT symmetrical structure and magneto-photonic crystal

Abstract

The invention discloses a tunable unidirectional crossed waveguide distributor based on a PT symmetrical structure and a magneto-photonic crystal, which belongs to the field of miniature optoelectronic devices. The distributor comprises a dielectric substrate. First, second, third and fourth arrays are located at four corners of the dielectric substrate respectively to form a crossed photonic crystal waveguide with four ports. A first gain column and a second gain column are set at the corners, which are close to the center of the crossed waveguide, of the first array and the fourth array respectively. A first loss column and a second loss column are set at the corners, which are close to the center of the crossed waveguide, of the second array and the third array respectively. The first gain column, the second gain column, the first loss column and the second loss column satisfy the parity-in-time symmetry condition. The first array, the second array, the third array and the fourth array apply an external magnetic field as required respectively. The waveguide distributor provided by the invention can realize the selective propagation of electromagnetic waves in any designed one tofour channels under different external magnetic fields, and can realize electromagnetic localization in any channel.

Description

technical field [0001] The invention belongs to the field of miniature optoelectronic devices, and in particular relates to a tunable unidirectional cross waveguide splitter based on a PT symmetry structure and a magneto-photonic crystal. Background technique [0002] In recent years, artificial bandgap materials, especially photonic crystals, have become the research focus of a new generation of smart materials due to their superior performance, especially the topological properties of artificial bandgap materials have attracted widespread attention. State, with defect immunity, backscattering suppression transmission characteristics, great potential application prospects. [0003] In a quantum mechanical system, if the Hamiltonian of the system Satisfy And with Operators have a common eigenvector, then the system has non-broken PT symmetry, that is, the potential function of Hamilton satisfies the even symmetry of the real part and the odd symmetry of the imaginary p...

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Problems solved by technology

[0007] The Chinese patent 201410363260.5 with the publication date of October 15, 2014 discloses a cross-shaped circulator based on a photonic crystal waveguide. Signals can enter from 4 ports, but can only be output from orthogonal adjacent ports; the publication date The Chinese patent 201410515362.4 on April 29, 2015 discloses a compact six-port photonic crystal circulator. Although there are six ports, it can only enter from the port and output from the adjacent port, and the direction of the signal output cannot be controlled. And the number of signal output channels, can only enter in one direction, determine the direction of one-way output, and the signal output mode is single

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