A Novel Terahertz Semiconductor Metamaterial for Slow Light Device and Dual-Band Modulator Applications
- 385 Downloads
In this paper, we propose a novel planar semiconductor metamaterial which consists of two H-shape structures which are nested together and composed of InSb deposited on a thin quartz substrate. The two H-shape structures serve as the bright modes and are exited strongly by the incident wave and interact with each other. This coupling leads to a powerful plasmonically induced transparency (PIT) effect at terahertz frequencies. This scheme provides a way to achieve slow light, and the corresponding group index can reach a value of 1300. We calculated group velocity dispersion (GVD) and saw this structure was a low group velocity dispersion (LGVD) system. Therefore, the proposed structure will be useful in designing slow-light devices, optical buffers, delay lines, and ultra-sensitive sensors. We also showed that the proposed design is tunable, namely changes in geometric parameters and type of semiconductor can largely change the group index. In addition, we considered another application for our design that is a thermal dual-band terahertz metamaterial modulator and numerically obtained frequency and amplitude modulation depth, tunability bandwidth, and loss for this device. We obtained an amplitude modulator depth of 99.7 % and a frequency modulator depth of 47 % that verified this structure can be used in wireless communication and encode information systems in the THz regime.
KeywordsElectromagnetically induced transparency Semiconductors Metamaterials Slow light
Authors are grateful to Dr. Z. Vafapour from the Johns Hopkins university for useful discussions.
- 8.Vafapour Z, Alaei H (2016) Achieving a High Q-Factor and Tunable Slow-Light via Classical Electromagnetically Induced Transparency (Cl-EIT) in Metamaterials, Plasmonics, doi: 10.1007/s11468-016-0288-0
- 18.Vafapour Z, Forouzeshfard MR (2016) Disappearance of Plasmonically Induced Reflectance by Breaking Symmetry in Metamaterials, Plasmonics. doi: 10.1007/s11468-016-0391-2
- 22.Finck ADK, Van Harlingen DJ, Mohseni PK, Jung K, Li X (2013) Anomalous modulation of a Zero-Bias peak in a hybrid Nanowire-Superconductor device. Phys Rev Lett 110(12):126406Google Scholar
- 32.Vafapour Z, Alaei H (2016) Subwavelength micro-antenna for achieving slow light at microwave wavelengths via electromagnetically induced transparency in 2-D metamaterial, Plasmonics, doi: 10.1007/s11468-016-0392-1
- 33.Izadshenas S, Zakery A, Vafapour Z (2016) Tunable slow light in graphene metamaterial in a broad terahertz range, Plasmonics, doi: 10.1007/s11468-016-0484-y
- 35.Smith D, Shiles E, Inokuti M, Palik D. (eds) (1985) Handbook of optical constants of solids. Academic, San DiegoGoogle Scholar