Research Of Polymer Optical Switch With Graphene-assisted Heating Layer

The rapid development of integrated circuits is driving the advancement of science,technology and the development of society.It is accompanied by people’s requirements and desire for high speed and high performance.Therefore,photonic integrated circuits have gradually entered the field of concern of people.Photonic integrated circuits have demonstrated superiority in traditional high-tech fields such as information processing,sensing technology,photon countermeasures,and photonic computers.They have excellent development space and prospects for both military and commercialization..Due to its compact structure and small size,the waveguide type optical switch has become an important device in photonic integrated circuits.Therefore,the preparation of optical switches with fast response speed and low power consumption has become the focus of research.Graphene materials have extraordinary mechanical,electronic and photonic properties that have attracted great attention in many fields.In the field of optics,graphene has been integrated with waveguide devices for polarizers,detectors and modulators.In this paper,by using the excellent thermal conductivity and flexibility of graphene materials,the polymer thermo-optic switch with graphene-assisted heating layer is simulated and designed to achieve short response time,low power consumption and flexibility.Firstly,analyzes the model of the three-layer slab structure theoretically,then analyzes the patterns of the rectangular and ridge waveguides by the Marcatili approximation method,and gives the corresponding characteristic equations.Thermo-optic effect and thermo-optic modulation theory,and introduces the principle of MZI structure switching operation through thermo-optic effect.An organic-inorganic hybrid MZI thermo-optic switch with graphene-assisted heating layer and air trench structure was proposed.The optical field and thermal field of the four structures were simulated.The influence of graphene materials on the polarization of different structures was analyzed.The electrode position was calculated by transmission loss,and the size optimization design of different structural devices is completed according to the analysis.After that,the influence of different upper and lower cladding materials on the device was analyzed,and the response time and power consumption of the device were simulated.Finally,the designed organic-inorganic hybrid thermo-optic switch with graphene heat-conducting layer is simulated,and the power consumption is lower than 0.95 m W.Compared with the conventional device,the heating efficiency can be increased by 78%.The optimized central heat conduction layer ridge structure has a rise and fall time of 7.3μs,83.7μs,and a power consumption of 0.85 m W.The optimized deep air thermal layer rectangular structure has a rise and fall time of 30μs,92.4μs,and a power consumption of 0.39 m W.The device is prepared,the waveguide structure is complete,and the shape is good;the metal electrode structure is complete,and the waveguide spacing is consistent with the design;the graphene layer has wrinkles;the device has good light transmission and the transmission loss is 37 d B.Then,a polymer thermo-optic switch with graphene-assisted heating layer and is proposed.The waveguide size is determined according to the single mode condition,and the influence of the electrode position on the optical transmission loss is analyzed to determine the electrode position.The analog device response time is: 33.49μs、97.06μs;power consumption: 0.57 m W.The parameters and methods of Before thermal embossing are optimized,and the device waveguide is prepared.The waveguide structure is complete and the light is good.After that,a polymer flexible thermo-optical switch was designed,and a ridge waveguide structure with a waveguide width of 5 μm,a ridge height of 3 μm and a panel height of 3 μm was designed according to the single-mode condition.The thermal field of the device on different substrates were simulated.The fall times and the rise time were 1.47 ms and 2.98 ms(without substrate),1.19 ms and 2.96 ms(PMMA substrate),0.62 ms and 2.06 ms(Si substrate),respectively.Finally,the graphene-assisted heating layer was added to the flexible polymer switch,and the simulated rise time and fall time were 0.23 ms and 0.35 ms,respectively(without substrate),and the heating efficiency was increased by 75%.The flexible optical waveguide structure can be used in a light control area of a wearable device.In summary,this thesis studies the organic/inorganic hybrid device with graphene heat conduction layer,all-polymer device and flexible device.It is theoretically verified that the introduction of graphene heat conduction layer can effectively improve the heating efficiency of the chip and reduce the power consumption.At the same time,shortening the switching time can be used as a reference for the study of graphene polymer waveguide devices.