Near-field propagation, particularly that enabled by reconfigurable intelligent surfaces (RIS), has emerged as a promising research topic in recent years. However, a comprehensive literature review on RIS-based near-field technologies is still lacking. This article aims to fill this gap by providing a brief overview of near-field concepts and a systematic survey of the state-of-the-art RIS-based near-field technologies. The focus is on three key aspects: the construction of ubiquitous near-field wireless propagation environments using RIS, the enabling of new near-field paradigms for 6G networks through RIS, and the challenges faced by RIS-based near-field technologies. This technical review intends to facilitate the development and innovation of RIS-based near-field technologies.

翻译：近场传播，特别是由可重构智能表面（RIS）支持的近场传播，近年来已成为一个颇具前景的研究课题。然而，目前仍缺乏对基于RIS的近场技术的全面文献综述。本文旨在通过简要概述近场概念并系统调研当前最先进的基于RIS的近场技术来填补这一空白。重点聚焦于三个关键方面：利用RIS构建泛在的近场无线传播环境、通过RIS为6G网络开辟新的近场范式，以及基于RIS的近场技术所面临的挑战。本篇技术综述旨在促进基于RIS的近场技术的发展与创新。