Long-range guided surface waves with transverse spin and subwavelength confinement for optical switching and sensing

通过模拟设计了光子晶体表面波的导波结构。这些由介电材料制成的结构被图案化成微结构，以实现近零折射率导模，用于在光子晶体上发射表面波。相邻近零折射率平板之间的间隔被用来控制建设性和/或破坏性干涉的形成，这些干涉实现了模仿光学逻辑门的不同光学功能。提出了与、或、异或逻辑门，并对异或门进行了实验验证。通过电子束光刻对导板进行图案化，制作了逻辑门器件，并利用工作在通信波长上的显微装置来表征器件的响应。

Structures that guide surface waves on a photonic crystal were designed by simulation. These structures made of a slab of dielectric material were patterned into microstructures to realize near-zero-index guided modes that were used to launch surface waves on the photonic crystal. The separation between adjacent near-zero-index slabs was used to control the formation of constructive and/or destructive interferences that realize different optical functions mimicking optical logic gates. AND, OR, and XOR logic gates were proposed and the XOR gate was demonstrated experimentally. The logic gate device was fabricated by patterning guiding slabs by electron beam lithography, and the device response was characterized using a microscopic setup operating in the telecommunication wavelengths.