Simulation and Design of LiNbO<inline-formula><tex-math notation="LaTeX">3_{3}</tex-math></inline-formula> Modulators With Switched Segmented Electrode Structure for High Bandwidth and Low Half-Wave Voltage

A lithium niobate thin-film(LNTF) electro-optic modulator(EOM) with segmented electrode structure is investigated, and the influence of the modulator&#x0027;s structural configuration on its performance is achieved. In contrast to conventional couplers, the design incorporates a 2 &#x00D7; 2 S-shaped directional coupler. Our modulator achieves a bandwidth of nearly 110 GHz and a half-wave voltage of 1.45 V $\cdot$ cm. A comparative analysis between two configurations: one with SiO$_{2}$ cladding covering the entire surface and the other with coverage limited to the electrode gaps, which reveals the latter potential for enhancing device performance. The accuracy of the simulation results is substantiated through both software analysis and theoretical calculations. The simulation results provide valuable insights for the design of LNTF EOM, highlighting the efficacy of the proposed segmented electrode structure

Dual-Channel Underwater Acoustic Topological Rainbow Trapping Based on Synthetic Dimension

The concept of “rainbow trapping” has generated considerable interest in wave propagation and energy harvesting, offering new possibilities for diverse and efficient acoustic wave operations. In this work, we investigate a dual-channel topological rainbow trapping device implemented within an underwater two-dimensional phononic crystal based on synthetic dimension. The topological edge states with different frequencies are separated and trapped at different spatial locations. Acoustic waves propagate simultaneously along two boundaries due to the degeneracy of the edge states. In particular, the propagation of a dual-channel topological rainbow is also realized by using a bend design. This work contributes to the advancement of multi-channel devices in synthetic space and provides a reference for the design of highly efficient underwater acoustic devices