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Logic gates have great importance in realization of rapid data transmission as well as low loss transfers. In this paper, a multi-objective inverse-design approach is implemented by using objective-first algorithm to design optical AND, OR, NAND and NOT logic gates on Si- platform at the design wavelength of 1.30 μm. For all gates, the design area is fixed to 2.24 μm × 2.24 μm. The optical logic “1” output is accepted to be optical power values greater than 0.8 times of the input optical power. By implementing a Bias waveguide as well as two input ports, we made it possible to achieve logic “1” output for logic operations having no inputs such as “0 NAND 0 = 1” and “0 NOT = 1”. We binarized the proposed logic gates, and then numerically analyzed them by using finite-difference time-domain (FDTD) method. Proposed AND gate yields 1.20 times of input power for “1 AND 1 = 1” logic operation and highest logic “0” is obtained for logic operation of “1 AND 0 = 0” as 0.40 times of the input power at the operating wavelength. It is also observed that proposed logic gates can operate not only at the design wavelength of 1.30 μm but also at broad wavelength regions as well. Finally, we demonstrate that it is possible to carry out complex logic operations by combining the proposed logic AND, OR and NAND gates to construct an XOR gate in the same platform.

Until now, many pioneering studies have been conducted on multiwavelength achromatic lens designs that can eliminate chromatic aberrations at various wavelengths. In these studies, the working bandwidth is still not wide enough for practical applications, and an effective achromatic design is achieved with a long design cycle that determines critical elements of the unit cell. To solve the limitations of the unit cell method, we use inverse design to simultaneously explore structures with broad bandwidth and high efficiency. In this study, we show that it is possible to obtain an achromatic cylindrical lens that can focus transverse electric and transverse magnetic polarization between 1300 and 1750 nm using the objective-first algorithm. We implement the generalized Bruggeman effective medium theory to binarize the lens with randomly varying index profiles while maintaining the optical performance of the cylindrical inverse-designed lens. The binarized lens is produced via three-dimensional printing and tested in a microwave regime, exhibiting high bandwidth operation and high focusing efficiency (average 62%).

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