TAILIEUCHUNG - Recent Optical and Photonic Technologies Part 4

Tham khảo tài liệu 'recent optical and photonic technologies part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 80 Recent Optical and Photonic Technologies the angular rotation of the phase mask a as L cos a 2 L sin a 2 and L cot 9 2 Lin et al. 2006a respectively. Where L is the grating period given by L X sin9 and X is the laser wavelength in the photoresist material. Band diagram of woodpile photonic crystal The woodpile-type photonic crystal template will be converted into high refractive index materials using the approach of CVD infiltration Miguez et al. 2002 Tétreault et al. 2005 in order to achieve a full bandgap photonic crystal. Maldovan Thomas 2004 We calculated the photonic bandgap for converted silicon structures where logs are in air while the background is in silicon. The calculation has been performed for photonic structures formed with various interference angles 6 and rotation angles a. Fig. 5 left shows the first Brillouin surface of the face-centered-orthorhombic lattice. Coordinates of high symmetric points on the Brillouin surface varies with different structures. MIT Photonic-Bands Package Johnson Joannopoulos 2005 was used to calculate the photonic bandgap of the converted silicon structure. Fig. 5 right shows the photonic band structure for the converted silicon woodpile-type structure with c L and a 51 the dielectric constant of was used for silicon in the calculation . Toader et al. 2004 We would like to clarify that the Ấphoton in the y-axis label of the Fig. 5 right is the wavelength of photons in the photonic band not the wavelength of the exposure laser. The band structure shows that a photonic full bandgap exists between the 2nd and 3rd bands with a bandgap size of of the gap central frequency. Wave vector Fig. 5. left First Brillouin surface of face-centered-orthorhombic lattice right photonic band structure for an orthorhombic photonic crystal. Ấphoton is the wavelength of photons in the photonic band. Bandgap size vs shifting Az and rotation a The significance of the overlap between the two alternating high-intensity .

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