Jin Peng’s scientific contributions

The transverse spins of guided waves and surface waves are studied in a rigorous and unified manner. In particular, analytical derivations show that the transverse spin of guided waves also depends on the mean direction of propagation, which may have important applications in spin-dependent unidirectional optical interfaces. As an example of which, we propose two optical logic gates related to the transverse spin of guided waves, i.e., the XNOR and XOR gates, which are realized via the Y-shaped and the T-shaped waveguides, respectively. The extinction ratios of XNOR and XOR logic gates are 16 dB and 14 dB respectively. Our results may have potential application value in the design of nanoscale integrated all-optical logic gate devices.