Metasurface-based terahertz absorbers have recently gained much attention in research on terahertz devices. However, the actual applications of such absorbers are severely constrained by issues such as difficult preparation procedures, constrained bandwidth, polarization, and incidence-angle sensitivity. This paper proposes a tunable broadband terahertz absorber scheme based on the metasurface of all-dielectric microspheres. The device consists of a single layer of strontium titanate microspheres compounded with a thin-film base. The Mie resonance of the microspheres works together with the metal film to achieve excellent absorption performance, while the modal coupling between the microspheres greatly broadens the absorption bandwidth. According to these findings, the device is capable of tunable absorption performance with a bandwidth of up to 0.18 THz. The terahertz broadband absorber proposed herein has a simple structure, superior performance, and low preparation cost, as well as potential applications in terahertz sensing, terahertz detection, and terahertz imaging.
The paper presents a new encode/decode scheme of OCDMA using optical scanning. After studying the principle of optical scanning encode/decoder, a new structure of optical scanning encode/decoder is proposed. It can be seen that all-optical spread spectrum OCDMA encode/decode can be realized by the proposed scheme with optical scanning. Consequently, it provides an approach of getting rid of the bottleneck of optical and electrical exchange. It also makes the integrating of OCDMA encode/decoder more easily.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.