The Investigation Of Design And Fabrication Of Photonic Quasicrystal

The concept of the quasicrystal was put forward by American scientist Steinhardtin1980s.Then the concept was introduced in solid state physics first.At thattime,the concept was explained “long-range order aperiodic structure”.Afterwards, the scientist Shechtman from Israel and chinese scientist GuoKexinobserved the quasicrystal phase in the Al-Mn and Ti-V-Ni alloy.This discoveriedshake the world of the physics and quasicrystal field highly. Opend the prelude ofstudy the quasicrystal.Finding the quasicrystal in the1980s,Triggered the upsurge in theworld.China,Japan and America leaded the studies of the quasicrystal.Manykinds of quasicrystal structures and materials are found in the alloy.So far,thescientist fabricate many kinds of alloy quasicrystal structures by use manyways,for example, extreme cold coagulation, deep supercooling technology,mechanical alloying and so on.In china,a team of researchers lead by GuoKexinacademician made a remarkable achievement in the alloy quasicrystal field.Theyfind5-fold,8-fold,12-fold symmetrical quasicrystal structures and first fabricate10-fold steady quasicrystal in millimetre level in the worldMany scientists extremely pay attention to the concept of quasicrystal, At themoment,many experiments prove that the photonic band gap material is not onlyconfined to the crystal structure of periodicity,and also exist in the quasicrystalstructure.The property of photonic band gap of the quasicrystal is much betterthan photonic crystal.So applied prospect is more wide. In this paper, the contentof the chapters are as follows,Chapter one,it mainly introduces the theoretical model of the photonicquasicrystal, production method and application of photonic quasicrystals.Chapter two, the structure design of the10-fold quasicrystal and researchproperty of the photonic band gap. By calculating the changing process of the relative width and the absolute width of the first photonic band gap with the fillfactor and the dielectric constant. Choosing the best10-fold quasicrystalstructure which have the best the photonic band gap.At last, calculating andcomparing the property of the photonic band gap of10-fold and8-fold,respectively.Chapter three, The investigation on defect mode property of the ten-fold photonicquasicrystal.By introduce line defect and point defect in the best10-foldquasicrystal structure,we can make out waveguide and microcavity structurewith good property and observe these structures can control photon movement.Chapter four, the part of experiment.In the chapter four, we fabricated the10-fold quasicrystal structure by multiple beam laser holographic lithography byuse a top-cut prism interferometer which is designed by ourselves.Then measuresthe transmission spectrum,diffraction pattern and microstructural of the10-foldquasicrystal structure.Chapter five,Design the Luneburg lens by use the Sunflower-type gradedphotonic crystals (GPCs).Then research the character of the lens.