A Method for Broadband Tuning of Surface Plasmon Bandgap by Dual-pump Light Interference

A surface plasmon and double-pump technology, which is applied in optics, nonlinear optics, instruments, etc., can solve the problems of difficult nano-sample preparation and difficult adjustment of band gap, and achieve the effect of broadband tuning

Active Publication Date: 2017-01-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide a dual-pump light interference to realize the broadband tuning of the surface plasmon bandgap for the current nonlinear MDM waveguide devices based on the SPP bandgap effect. Methods

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  • A Method for Broadband Tuning of Surface Plasmon Bandgap by Dual-pump Light Interference
  • A Method for Broadband Tuning of Surface Plasmon Bandgap by Dual-pump Light Interference
  • A Method for Broadband Tuning of Surface Plasmon Bandgap by Dual-pump Light Interference

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[0017] In order to describe the technical content, structural arrangement, achieved purpose and effect of the present invention in detail, a specific example will be combined with accompanying drawings to describe in detail below.

[0018] The structure diagram of the present invention is as figure 1 As shown, the method of double-pump light interference to achieve broadband tuning of the surface plasmon bandgap includes a three-layer waveguide structure of metal 1-dielectric 3-metal 2, which is used to construct the transmission channel of surface plasmons, usually , 1 and 2 are the same metal material; two identical metal-dielectric coupling gratings 4 are used to realize the efficient coupling of the double pump light and the nano waveguide respectively; the dielectric 3 is a Kerr nonlinear material, and its refractive index varies with The intensity of the pump light changes; two coupling gratings 4 are respectively located at the left and right ends of the upper metal 1 s...

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Abstract

The invention discloses a method for achieving surface plasmon polariton (SPP) band gap broadband tuning by means of double-pump light interference in a metal-dielectric-metal (MDM) waveguide. The method is characterized in that a Kerr nonlinear electric dielectric layer is introduced into the MDM, two beams of pump light are coupled into the waveguide through a metal optical grating for reverse transmitting, interference occurs, the refractive index of Kerr electric dielectric is tuned periodically through interference stripes, and accordingly an SPP band gap is formed. Meanwhile, by means of change of interference behaviors of the pump light, broadband tuning of the SPP band gap from a visible band to a near-infrared band is achieved. The method is simple and reliable, can achieve SPP band gap broadband tuning in the same structure and develops a new approach to MDM device application.

Description

technical field [0001] The invention relates to the field of surface plasmon photonics, in particular to a method for realizing the broadband tuning of the surface plasmon bandgap by double pump light interference. Background technique [0002] When visible or near-infrared light is irradiated on the metal-dielectric interface, the free electrons on the metal surface collectively oscillate, forming an electron density wave propagating along the metal surface, that is, surface plasmon polariton (SPP). The transverse optical field of SPP is highly localized and can confine light energy to the nanoscale for transmission, which is expected to break through the optical diffraction limit and has important application prospects in future high-density all-optical integration. At present, people have designed a variety of SPP waveguide structures. Among them, the MDM waveguide has attracted widespread attention because of its small mode field size, acceptable transmission distance, e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/365
Inventor 刘晔毛庆和
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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