Abstract-Guiding terahertz orbital angular momentum beams in multimode Kagome hollow-core fibers

Haisu Li, Guobin Ren, Bofeng Zhu, Yixiao Gao, Bin Yin, Jing Wang, and Shuisheng Jian

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-42-2-179

We explore terahertz (THz) orbital angular momentum (OAM) modes supported in multimode Kagome hollow-core fibers. Numerical models are adopted to characterize the effective indices and confinement losses of vector modes over 0.2–0.9 THz, where two low-loss transmission windows are observed. Linearly combining the vector modes, THz OAM states can be generated. Covering a broad bandwidth of 0.25 THz, the purity values of OAM modes are beyond 0.9. Using numerical simulations, the hollow-core THz fibers with one and two rings of Kagome structures are also comparably investigated. We reveal that the OAM purity is dependent upon the confinement performance of THz fiber.

© 2017 Optical Society of America

Full Article  |  PDF Article

Abstract-Tunable subwavelength terahertz plasmon-induced transparency in the InSb slot waveguide side-coupled with two stub resonators

Tunable subwavelength terahertz plasmon-induced transparency in the InSb slot waveguide side-coupled with two stub resonators Huaiqing Liu, Guobin Ren, Yixiao Gao, Yudong Lian, Yang Qi, and Shuisheng Jian  »View Author Affiliations

Applied Optics, Vol. 54, Issue 13, pp. 3918-3924 (2015)
http://dx.doi.org/10.1364/AO.54.003918

http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-54-13-3918

View Full Text Article

Enhanced HTML    Acrobat PDF (929 KB)

We numerically investigated the realization of electromagnetically induced transparency (EIT) at the terahertz (THz) region in an InSb slot waveguide side-coupled with two stub resonators. The mechanism of the EIT phenomenon is theoretically analyzed and numerically studied by using coupled mode theory and the finite element method, respectively, and the theoretical results are in good agreement with the simulation results. The simulation results reveal that the EIT-like response is strongly dependent on the coupling separation between the two stub resonators, and we derived the best separation between the two stub resonators to get the most obvious EIT-like spectra. More importantly, the central wavelength of the EIT-like spectra can be actively controlled by tuning the temperature. This plasmonic waveguide system may have potential applications for ultracompact THz integrated circuits, such as thermo-tunable filters, THz switching, slow-light components, and THz sensitive sensors.

© 2015 Optical Society of America

Abstract-Tunable subwavelength terahertz plasmon-induced transparency in the InSb slot waveguide side-coupled with two stub resonators

Tunable subwavelength terahertz plasmon-induced transparency in the InSb slot waveguide side-coupled with two stub resonators Huaiqing Liu, Guobin Ren, Yixiao Gao, Yudong Lian, Yang Qi, and Shuisheng Jian  »View Author Affiliations

Applied Optics, Vol. 54, Issue 13, pp. 3918-3924 (2015)
http://dx.doi.org/10.1364/AO.54.003918

http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-54-13-3826

View Full Text Article

Enhanced HTML    Acrobat PDF (929 KB)

We numerically investigated the realization of electromagnetically induced transparency (EIT) at the terahertz (THz) region in an InSb slot waveguide side-coupled with two stub resonators. The mechanism of the EIT phenomenon is theoretically analyzed and numerically studied by using coupled mode theory and the finite element method, respectively, and the theoretical results are in good agreement with the simulation results. The simulation results reveal that the EIT-like response is strongly dependent on the coupling separation between the two stub resonators, and we derived the best separation between the two stub resonators to get the most obvious EIT-like spectra. More importantly, the central wavelength of the EIT-like spectra can be actively controlled by tuning the temperature. This plasmonic waveguide system may have potential applications for ultracompact THz integrated circuits, such as thermo-tunable filters, THz switching, slow-light components, and THz sensitive sensors.

© 2015 Optical Society of America