Browsing OSU - Faculty and Staff Publications by Author "Zhang, Weili"

Now showing items 1-11 of 11

    • Controlling metamaterial resonances via dielectric and aspect ratio effects 

      Chiam, Sher-Yi; Singh, Ranjan; Zhang, Weili; Bettiol, Andrew A. (AIP Publishing, 2010-11-09)
      We study ways to enhance the sensitivity and dynamic tuning range of the fundamental inductor-capacitor (LC) resonance in split ring resonators (SRRs) by controlling the aspect ratio of the SRRs and their substrate thickness. ...

    • Cryogenic temperatures as a path toward high-Q terahertz metamaterials 

      Singh, Ranjan; Tian, Zhen; Han, Jiaguang; Rockstuhl, Carsten; Gu, Jianqiang; Zhang, Weili (AIP Publishing, 2010-02-19)
      Optical properties of planar thin film metamaterials were measured at room and liquid nitrogen temperatures using terahertz time-domain spectroscopy. The operation of metamaterials at cryogenic temperatures is anticipated ...

    • Dielectric response of soft mode in ferroelectric SrTiO3 

      Han, Jiaguang; Wan, Fan; Zhu, Zhiyuan; Zhang, Weili (AIP Publishing, 2007-01-16)
      The authors report far-infrared dielectric properties of powder form ferroelectric SrTiO3. Terahertz time-domain spectroscopy (TDS) measurement reveals that the low-frequency dielectric response of SrTiO3 is a consequence ...

    • Electromagnetically induced transparency in terahertz plasmonic metamaterials via dual excitation pathways of the dark mode 

      Liu, Xiaojun; Gu, Jianqiang; Singh, Ranjan; Ma, Yingfang; Zhu, Jun; Tian, Zhen; He, Mingxia; Han, Jiaguang; Zhang, Weili (AIP Publishing, 2012-03-26)
      We observe the excitation and tuning of electromagnetically induced transparency (EIT) by the interference between different excitation pathways of the dark mode in a planar terahertz metamaterial. The EIT unit cell consists ...

    • Modulating the fundamental inductive-capacitive resonance in asymmetric double-split ring terahertz metamaterials 

      Yang, Yuanmu; Huang, Ran; Cong, Longqing; Zhu, Zhihua; Gu, Jianqiang; Tian, Zhen; Singh, Ranjan; Zhang, Shuang; Han, Jiaguang; Zhang, Weili (AIP Publishing, 2011-03-24)
      We investigate resonant transmission of planar asymmetric metamaterials made from double split-ring resonators. As the symmetry of the unit cell resonator is broken by displacing the two gaps away from the center in opposite ...

    • Observing metamaterial induced transparency in individual Fano resonators with broken symmetry 

      Singh, Ranjan; Al-Naib, Ibraheem A. I.; Yang, Yuping; Chowdhury, Dibakar Roy; Cao, Wei; Rockstuhl, Carsten; Ozaki, Tsuneyuki; Morandotti, Roberto; Zhang, Weili (AIP Publishing, 2011-11-15)
      Metamaterial induced transparency is demonstrated using individual split ring resonators with two gaps on opposite side. For the symmetric structure, only a low quality dipolar resonance is witnessed at a normal incidence ...

    • Probing the transition from an uncoupled to a strong near-field coupled regime between bright and dark mode resonators in metasurfaces 

      Singh, Ranjan; Al-Naib, Ibraheem; Chowdhury, Dibakar Roy; Cong, Longqing; Rockstuhl, Carsten; Zhang, Weili (AIP Publishing, 2014-08-27)
      The coupling of multiple plasmonic resonators that sustain bright or dark modes provide intriguing spectral signatures. However, probing the onset of coupling effects while engaging the resonators with an increasing proximity ...

    • Quasioptic dielectric tetrahertz cavity: Coupled through optical tunneling 

      Zhang, Weili; Zhang, Jiangquan; Grischkowsky, D. (AIP Publishing, 2001-04-23)
      We report the observation of the well defined oscillation of a picosecond tetrahertz (ps THz) pulse within a dielectric concentric cy1indrica1 cavity, which is coupled to an incoming focused beam of ps THz pulses by the ...

    • Strong influence of packing density in terahertz metamaterials 

      Singh, Ranjan; Rockstuhl, Carsten; Zhang, Weili (AIP Publishing, 2010-12-16)
      We investigate the response of a terahertz metamaterial depending on the unit cell density. The fundamental inductive capacitive (LC) resonance has its highest quality (Q) factor for a critical period Pc=lambda/n, with ...

    • Tailoring the slow light behavior in terahertz metasurfaces 

      Manjappa, Manukumara; Chiam, Sher-Yi; Cong, Longqing; Bettiol, Andrew A.; Zhang, Weili; Singh, Ranjan (AIP Publishing, 2015-05-04)
      We experimentally study the effect of near field coupling on the transmission of light in terahertz metasurfaces. Our results show that tailoring the coupling between the resonators modulates the amplitude of resulting ...

    • Ultrasensitive terahertz sensing with high-Q Fano resonances in metasurfaces 

      Singh, Ranjan; Cao, Wei; Al-Naib, Ibraheem; Cong, Longqing; Withayachumnankul, Withawat; Zhang, Weili (AIP Publishing, 2014-10-27)
      High quality factor resonances are extremely promising for designing ultra-sensitive refractive index label-free sensors, since it allows intense interaction between electromagnetic waves and the analyte material. Metamaterial ...