Terahertz Applications Inspired by Photonics

摘要

This paper discusses how photonics technologies can be efficiently utilized in terahertz (THz) applications, by showing some of our recent results. First, an information tag, which is attached to the object for identification, is designed and fabricated using a THz photonic crystal slab. By storing information in both frequency and spatial domains, the information density of the tag is increased to 48 bit/cm², which is the highest capacity achieved to date among THz tags. Second, a photonic nanojet phenomenon, which generates localized electromagnetic fields in the shadow side of a dielectric sphere, is applied to enhance a spatial resolution of THz imaging by a factor of 2.2, i.e., 275-GHz-imaging resolution can be obtained by using a 125-GHz signal source.