Calculating And Fabrication Of Three-Dimension Photonic Crystal & Development Of Femtosecond Laser Microfabrication System

Recently, research on femtosecond laser two-photon-absorption microfabricationtechnology and Photonic Crystal (PhC) has obtained worldwide researchers'interesting. The paper also did some work on this domain.Firstly, the paper developed a laser microfabricating system, and introduced itslight source and hardware, as well as a controller software source on scanner mirror.Meanwhile, some analysize was made on the problem of mistrue and its correction.Femtosecond TPA micro fabrication adopt non-line interaction between ultrashort laser pulse and material, i.e. two-photon-absorption photopolymerization torealize any shape 3D solidification, working along with 3D scanning. The papermainly discussed the principle and feature of TPA photopolymerization; deduced itscalculating formula of resolution. Also, two cases made by TPA photopolymerizationhave been given.Those years, research on PhC has obtained a great results. And theory calculationon Photonic Band Gap (PBG) structure can give a indication on how to researchPhC's fabrication and its application. A numerical method based on Finite DifferenceTime Domain (FDTD) scheme for computing the photonic band-structure of threedimensional photonic crystals is introduced in this paper. Also, the accuracy andstability, numerical dispersion, boundary Conditions as well as excitation attaching tothe scheme are detailed analyzed. For checking the method, the simulating results ofphotonic band structure on two type lattices are presented (FCC and Diamondstructure). These two examples show that the FDTD method is an effective approachfor the photonic band structure simulating of 3-dimension photonic crystals. Theresults showed that there are full PBG and qusi-full PBG in FF and diamond structurerelatively. From this, the paper choose 3D Logpile structure PhC to make someresearch for fabricating.Finally, adopting the system developed in the paper and TPA photopoly- merization technology, 3D Logpile structure PhC has been fabricated in our lab, andwas measured by infrared spectrometer. The results showed that there is a qusi-fullPBG in the PhC structure fabricated by us, which proved prediction in the paper.Meanwhile, it indicated that the FDTD method is a good way to calculate PBGstructure, and femtosecond TPA microfabrication is a good method to make some PhCstructures.