Fabrication And Spectral Property Of Micro- Nano Photonic Structures

Micro-nano photonic structure,which has micro-nano inner size,has a specific effect on the generation,transmission,regulation,sensing and detection of light.With the rapid development of micro processing technology,the research on preparation and property of micro-nano photonic structure becomes one of research hotspots in the field of optics and materials because of its novel structure and optical property.The fabrication and application of micro-nano photonic structures are discussed in this paper.Two-dimensional periodic structures with different morphology,sizes,and materials are obtained by holographic symmetry-lost multiple beams interference.We also get Au nanoparticles with different particle sizes,structural units and spectral response characteristics,which are produced by metal sputtering deposition and high temperature annealing treatment.Furthermore,laser excitation phenomenon is obtained by Au nanoparticles coated with dye layer on their surface.The main works in this thesis are summarized into the following four parts:(1)Based on the theory of multi-beam interference,the influence of beam polarization and light intensity on interference structure is analyzed qualitatively and quantitatively.The variation of polarization changes the amplitude vector of the electric field of light wave,which changes the spatial light intensity distributions.Light intensity variation directly affects the spatial light intensity distributions,leading to space ratio of the medium increasing with beam intensity enlarging.The influence of light intensity on the interference structure can be controlled by adjusting the beam power and exposure time in holographic interference experiment,thus obtaining structures with different media filling ratio.(2)The theory and experiment of two-dimensional micro-nano photonic structures by symmetry-lost beam interference are studied.Two-dimensional hexagonal lattices,which have diverse structure units,surface mophalogy and chirality symmetry,are obtained by symmetry-lost 4 and 5 beams interference with different polarizations.High quality two-dimensional photonic structures are generated with CHP-C positive photoresist and SU-8 negative photoresist,which shows the same structure morphology and periodic distributions with simulation results.The fabrication of large-area and good uniformity photonic structures provides an effective method for producing composed structures and chiral stuctures.(3)Gold nanoparticles with different morphology are obtained by employing metal sputtering deposition and high temperature annealing treatment.The sputtering current,sputtering time,annealing temperature and substrate material have effects on the morphology and properties of Au nanoparticles.In a given range,the larger the sputtering current or the longer the sputtering time is,the thicker the Au film and the larger the particle sizes are.The Au nanoparticles tends to be smaller and neater with the increase of annealing temperature during a given temperature range.The normal glass has poor heat resistance and leads to rough and irregular shapes particles,while the particles are homogeneous and round-like structures with quartz because of its good heat resistance.(4)Laser emission phenomena and laws are studied by coating dyes on the surface of Au particles.For DCJTB:Au@PMMA model,the excitation threshold is lower when the Au particles distribution tends to be even more homogeneous.The larger and more irregular the particle are,the red shift of the sample occurs.It is necessary to obtain lasing phenomenon that there are overlap between extinction peak of metal particles and photoluminescence peak of dyes.With the change of pump light polarization,the lasing peak intensity changes.When the polarization angle of pumped beam is 45 °,the lasing intensity is the largest.The fluorescence enhancement is obtained with Au nanoparticles and two-dimensional quasicrystals coated with F8 BT by ultraviolet pulse 355 nm beam excitation.The study of micro-nano photonic structures provides structure materials for learning the interaction between light and matter as well as optical transmission characteristics,which could provide a feasible direction for the construction and development of artificial metamaterials with superior performance.The fabrication of micro-nano photonic structures also provides a new idea of new photonic devices with miniaturization,low energy consumption and high integration,which could be expected to pave a way for the development of micro-nano photonics,optical information technology and optoelectronic industry.