TY - JOUR T1 - Sub-wavelength spatial resolution in a 2D photonic crystal lens based on a complex square lattice TT - تفکیک فضایی زیر طول موجی در متمرکز کننده‏ی بلور فوتونی بر پایه‏ی شبکه‏ی مربعی ترکیبی JF - opsi JO - opsi VL - 20 IS - 0 UR - http://opsi.ir/article-1-152-en.html Y1 - 2014 SP - 253 EP - 256 KW - 2D photonic crystal KW - Sub-wavelength spatial resolution KW - Negative index materials KW - Integrated optics N2 - Abstract- We study the potential of sub-wavelength spatial resolution of a two dimensional complex square-lattice photonic crystal (PC) consisting air holes immersed in the Ge medium. The band diagram calculations and the wave propagation studies are done utilizing the finite difference time domain method (FDTD) incorporating periodic and perfectly matched layer (PML) boundary conditions. In contrast to the common square PCs, photonic band structure shifts to the lower frequencies and the frequency corresponding to the effective negative refraction occurs in the second photonic band in near-infrared region, in our model system M3 ER -