| Popis: |
In this work, an optimized structure of an XOR gate working in the optical domain is put for- ward to achieve high contrast ratio and extremely compact dimensions using a photonic crystal platform. The above structure employs silicon rods in a hexagonal lattice configuration. The design works purely on linear interference effect between the incoming light signals and does not involve any non-linear materials. The Finite Difference Time Domain based simulations are utilized to study the propagation of light within the structure and the Plane Wave Expansion Method is applied to generate bandgap structure. After optimization of the various design parameters, a contrast ratio of 31.76 dB is attained by the proposed structure along with a response time of 0.46 ps and a footprint of 42.24 μm2. The device can be operated in the C Band with optimum performance at 1550 nm, which is the telecommunication wavelength. The operating bit rate for the proposed structure is 2.17 Tbps. All-optical XOR gate being a universal gate forms the building blocks of various sequential and combinational logic designs suitable for optical computing and communication applications. |
