All-optical diode

Abstract

The invention discloses an all-optical diode, and relates to the technology of all-optical asymmetric transmission. The all-optical diode comprises a photonic crystal flat plate and a plane grating, the photonic crystal flat plate and the plane grating are arranged in parallel, the photonic crystal flat plate comprises an energy band structure with double Dirac cones, the double Dirac cones are intersected at a Dirac point, the Dirac point is located at a center of a Brillouin zone of the photonic crystal flat plate, the equivalent refractive index of the photonic crystal flat plate is zero ata frequency of the Dirac point, the frequency of an optical signal emitted to the all-optical diode is the frequency of the Dirac point, the thickness of the plane grating is arranged to enable the light intensity of a zero-order diffracted light to be zero when the optical signal is vertically emitted at one side of the plane grating, the transmissivity approaches zero when the optical signal isvertically emitted from one side of the plane grating, and the transmissivity approaches 1 when the optical signal is vertically emitted from one side of the photonic crystal flat plate. The all-optical diode is advantageous in that the structure is simple, the forward and reverse transmission contrasts are high, the forward transmissivity is high, the requirement of a strong field is avoided, and the integration is easy.

Description

technical field [0001] The invention relates to an all-optical asymmetric transmission technology, in particular to an all-optical diode, belonging to the technical fields of optical communication and optical computing. Background technique [0002] The all-optical diode is an important micro-nano optical device. Its asymmetric transmission structure allows the light signal to pass in one direction, while in the opposite direction, it passes little or almost nothing. In short, it realizes the unidirectional transmission of light. transmission. Just as the basic element of the electric diode is needed for the operation function of the traditional integrated circuit system, the operation and processing of all-optical signals are also inseparable from the unit that can make the optical signal meet the asymmetric transmission, the so-called all-optical diode. Therefore, all-photodiodes have important application prospects in the fields of optical computing, optical interconnect...

AI Technical Summary

Problems solved by technology

[0003] In order to realize the asymmetric transmission of light, the key is to break the time-reversal symmetry of light transmission, which can be achieved by means of magneto-optic materials or nonlinear optical effects. However, these methods not only require strong magnetic fields or strong optical fields, but also The equipment is huge and complex, and it is difficult to adapt to the integration of silicon-based nanophotonic chips

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