Optical computing metasurfaces: applications and advances.

Integrated photonic devices and artificial intelligence have presented a significant opportunity for the advancement of optical computing in practical applications. Optical computing technology is a unique computing system based on optical devices and computing functions, which significantly differs from the traditional electronic computing technology. On the other hand, optical computing technology offers the advantages such as fast speed, low energy consumption, and high parallelism.

Polarizable TIP7P Water Model with Perturbation Charges Evaluated from ABEEM.

A polarizable version of the rigid seven-site (TIP7P) water model with the atom-bond electronegativity equalization method (ABEEM) is proposed. The model uses direct polarization, where an isolated water monomer in the equilibrium geometry is assumed as a reference state and the polarization of the monomer arises from interacting with other molecules as a perturbation of the reference state. The charge on each site of the monomer splits into reference charge and perturbation charge.

Seven-Site Effective Pair Potential for Simulating Liquid Water.

Constant pressure simulations were carried out to construct a new rigid nonpolarizable seven-site water model (TIP7P), which is an effective and efficient version of flexible seven-fluctuating-charge water model. In this model, the positive charges are located on three nuclei and the negative charges disperse on two bond sites at the geometric center of each OH bond and two lone-pair sites along the tetrahedral direction away from the oxygen atom. Our new model performs better than other models in properties, such as radial distribution function, liquid density, thermal expansion coefficient, isothermal compressibility, vaporization enthalpy, isobaric heat capacity, static dielectric constant, self-diffusion coefficient, critical temperature, and density.