Metamaterials have been widely applied in the polarization conversion of terahertz (THz) waves. However, common plasmonic metamaterials usually work as reflective devices and have low transmissions. All-dielectric metamaterials can overcome these shortcomings. An all-dielectric metamaterial based on silicon with elliptical air holes is reported to achieve high artificial birefringence at THz frequencies. Simulations show that with appropriate structural parameters the birefringence of the dielectric metamaterial can remain flat and is above 0.7 within a broad band. Moreover, the metamaterial can be designed as a broadband quarter wave plate. A sample metamaterial was fabricated and tested to prove the validity of the simulations, and the sample could work as a quarter wave plate at 1.76 THz. The all-dielectric metamaterial that we proposed is of great significance for high performance THz polarization converters.
|Original language||English (US)|
|Number of pages||7|
|State||Published - Feb 15 2018|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the National Basic Research Program of China (2014CB339800), the National Natural Science Foundation of China (61422509, 61622505, 61427814, 61377047 and 61420106006), the Program for Changjiang Scholars and Innovative Research Team in University (IRT13033), the Cooperative Innovation Center of Terahertz Science , and the U.S. National Science foundation (ECCS-1232081).