Comment on "Poynting vector, orbital and spin momentum and angular momentum versus optical force and torque on arbitrary particle in generic optical fields"

TL;DR

This paper critically examines and questions the originality and correctness of recent ideas and results presented by Ng et al. regarding optical momentum and angular momentum in optical fields.

Contribution

It provides a critical analysis challenging the validity and novelty of Ng et al.'s findings on optical forces and momenta.

Findings

Identifies potential issues in Ng et al.'s claims

Questions the originality of their ideas

Highlights possible inaccuracies in their results

Abstract

We criticize the originality or correctness of some of the ideas and results recently reported by Ng et al. in arXiv:1511.08546.