title: Tunable nonreciprocal terahertz transmission and enhancement based on metal/magneto-optic plasmonic lens.
abstract: A tunable metal/magneto-optic plasmonic lens for terahertz isolator is demonstrated. Based on the magneto-optical effect of the semiconductor material and non-symmetrical structure, this plasmonic lens has not only the focusing feature but also nonreciprocal transmission property. Moreover, a transmission enhancement through this device greatly larger than that of the ordinary metallic slit arrays is contributed by the extraordinary optical transmission effect of the magneto surface plasmon polaritons. The results show that the proposed isolator has an isolation bandwidth of larger than 0.4THz and the maximum isolation of higher than 110dB, and its operating frequency also can be broadly tuned by changing the external magnetic field or temperature. This low-loss, high isolation, broadband tunable nonreciprocal terahertz transmission mechanism has a great potential for terahertz application systems.
authors.affiliation: Institute of Modern Optics, Nankai University, Key Laboratory of Optical Information Science and Technology, Ministry of Education, Tianjin 300071, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Fan
authors.forename: Sai
authors.initials: S
authors.lastname: Chen
authors.forename: Xiang-Hui
authors.initials: XH
authors.lastname: Wang
authors.forename: Sheng-Jiang
authors.initials: SJ
authors.lastname: Chang
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D008280:Magnetics / Q000295:instrumentation*; D008670:Metals / Q000737:chemistry*; D012031:Refractometry / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D055053:Terahertz Radiation
chemical_list: D008670:Metals