Design and Performance Investigation of Compact and Fast Metaphotonics All-Optical Digital OR Gate

The paper presents an all-optical OR logic gate utilizing the phenomenon of light beam interference. The silicon substrate contains a two-dimensional photonic crystal (2D-PC) structure, which is created by arranging air holes in a precise configuration. A thorough investigation of the proposed metaphotonics gate is carried out using the finite-difference time-domain (FDTD) method. The findings highlight the gate's capacity to precisely execute its truth tables at a wavelength of 1550 nm, which is essential for C-band fiber-optic communication systems. The construction of the device has a unique bend geometry of 60 degrees, which results in a minimum device area of 40.8 μm
²
, a high contrast ratio (CR) of 11.23 dB, and fast response time of 0.105 ps.