Point Defects in GaAs Photonic Crystals

• Autorzy: Dissanayake S. E. , Wijewardena Gamalath K. A. I. L.

Identyfikatory

DOI

10.18052/www.scipress.com/ILCPA.43.91

• Języki publikacji: EN

Abstrakty

EN

Applying plane wave expansion method to one dimensional multilayer system formed from alternating layers of GaAs and air, a defect mode was artificially introduced by removing a GaAs layer at the centre of a supercell and the band structures and mode field distributions were obtained. The defect mode normalized frequency was 0.28. The parameters for developing a Febry-Perot filter in the visible frequencies are given. The point defects in a two dimensional square lattice formed from GaAs rods of radius 0.16a in air was created by removing one GaAs rod at the centre of a supercell and also by increasing the centre GaAs rod radius to 0.5a. The removal of the rod folded the band structure 25 times creating a localized evanescent defect mode. The increment of the centre GaAs rod radius led to five defect bands inside the band gap with one degenerate state creating a monopole, two quadrupoles and two hexapoles. Evolution of the defect modes with the variation of the radius of GaAs rod is also presented.

Słowa kluczowe

EN

photonic crystal; square lattice; plane wave expansion; GaAs; multilayer; supercell; band structure; mode field distribution; defect mode

• Wydawca: Przedsiębiorstwo Wydawnictw Naukowych "DARWIN"
• Czasopismo: International Letters of Chemistry, Physics and Astronomy
• Rocznik: 2015
• Tom: Vol. 43
• Strony: 91--102
• Opis fizyczny: Bibliogr. 9 poz., rys., wz.

Twórcy

autor

Dissanayake S. E.

• Department of Physics, University of Colombo, Colombo 3, Sri Lanka

autor

Wijewardena Gamalath K. A. I. L.

• Department of Physics, University of Colombo, Colombo 3, Sri Lanka

Bibliografia

• [1] J. W. S. Rayleigh, Phil. Mag. 26 (1988) 256-265.
• [2] V. P. Bykov, Sov. Phys. JETP 35 (1972) 269-273.
• [3] E. Yablonovich, Phys. Rev. Lett. 58 (1987) 2059-2062.
• [4] S. John, Phys. Rev. Lett. 58 (1987) 2486-2489.
• [5] K. M. Ho, C. T Chang, C. M. Soukoulis, Phys. Rev. Lett. 65 (1990) 3152-3155.
• [6] S. C. Johnson, J. D. Joannopoulos, Opt. Express 8 (2001) 173-190; J. D. Joannopolus, S.C. Johnson J.N. Winn, R.D. Meade, Photonic Crystals: Modeling the flow of light, Princeton University Press, (2008) Chapter 5, p. 66-72.
• [7] K. Skoda, Phys. Rev. B. 52 (1995) 8992-9002.
• [8] F. Bloch, Z. Physik 52 (1928) 555–600.
• [9] S. E. Dissanayake, K. A. I. L. Wijewardena Gamalath, ILCPA 5 (2014) 58-88.