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We show that it is possible to design two photonic crystal (PC) structures such that an optical beam of desired wavelength gets guided within the line defect of the first structure (photonic band gap guidance) and the same beam gets guided in the second structure by self-collimation. Using two dimensional simulation of a design made of the combination of these two structures, we propose an optical junction that allows for crossing of two optical signals of same wavelength and same polarization with very low crosstalk. Moreover, the junction can be operated at number of frequencies in a wide range. Crossing of multiple beams with very low cross talk is also possible. The proposed junction should be important in future integrated photonic circuits.

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We show the possibility of three-port asymmetric (three-port ordered-route) light transmission in a linear, time-independent and non-magnetic structure of photonic crystals. A two-dimensional (2-D) hybrid structure of two photonic crystals, one of circular and the other of elliptic dielectric rods in air background with three ports has been considered to demonstrate this possibility. The structure favours optical propagation in the order A→B, B→C, C→A, while, optical propagation in the opposite order (A→C, C→B, B→A) is unfavourable.