Browsing School of Electronic Engineering and Computer Science by Author "Zaman, AM"
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Active Polarization Modulation of Terahertz Radiation Using Metamaterial/Graphene-Based Optoelectronic Devices
Zaman, AM; Lu, Y; Almond, NW; Burton, OJ; Alexander-Webber, J; Hofmann, S; Mitchell, T; Griffiths, JDP; Beere, HE; Ritchie, DA (2022-01-01)We investigate the modulation performance of a metamaterial/graphene optoelectronic device in the THz range. Operating characteristics such as amplitude, phase and polarization modulations of broadband THz radiation are ... -
Contactless 3D surface characterization of additive manufactured metallic components using terahertz time-domain spectroscopy
Lu, Y; Zhu, H; Zaman, AM; Rennie, AEW; Lin, H; Tian, Y; Degl'Innocenti, R (Optica Publishing Group, 2023-08-09)Terahertz time-domain spectroscopy has experienced significant progress in imaging, spectroscopy, and quality inspection, e.g., for semiconductor packaging or the automotive industry. Additive manufacturing alloys (also ... -
Near Field Analysis of Individual High Quality Factor THz Resonators
Hale, LL; Lu, Y; Zaman, AM; Addamane, S; Brener, I; Mitrofanov, O; Degl'innocenti, R (2023-01-01)Asymmetric split ring resonators supporting high quality factor modes are investigated using aperture near-field microscopy. Modes of varying Q-factor are measured, and a novel cross-polarization measurement technique is ... -
Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators.
Lu, Y; Hale, LL; Zaman, AM; Addamane, SJ; Brener, I; Mitrofanov, O; Degl'Innocenti, R (American Chemical Society, 2023-08-03)Metamaterial resonators have become an efficient and versatile platform in the terahertz frequency range, finding applications in integrated optical devices, such as active modulators and detectors, and in fundamental ... -
Non-contact imaging of terahertz surface currents with aperture-type near-field microscopy
Norman, S; Seddon, J; Lu, Y; Hale, L; Zaman, AM; Addamane, S; Brener, I; Degl'Innocenti, R; Mitrofanov, O (Optica Publishing Group, 2024-06-17)Terahertz (THz) near-field imaging and spectroscopy provide valuable insights into the fundamental physical processes occurring in THz resonators and metasurfaces on the subwavelength scale. However, so far, the mapping ... -
Surface Roughness Measurement of 3D-Printed 316L Stainless Steel Surface using Terahertz Time-Domain Spectroscopy
Lu, Y; Zhu, H; Zaman, AM; Lin, H; Deglinnocenti, R; Tian, Y (IEEE, 2022-01-01)The ultra-rough surface of the 3D-printed metal produced by laser powder bed fusion technique is one of the major challenges faced in commercializing 3D-printed metallic components in a wider context. The electrochemical ... -
Terahertz Metamaterial Optoelectronic Modulators with GHz Reconfiguration Speed
Zaman, AM; Lu, Y; Romain, X; Almond, NW; Burton, OJ; Alexander-Webber, J; Hofmann, S; Mitchell, T; Griffiths, JDP; Beere, HE (IEEE, 2022-05-30)All-electronic ultrafast control of terahertz radiation is demonstrated in integrated metamaterial/graphene devices. By electrostatic gating the graphene conductivity, the overall optical response of the incident terahertz ... -
THz Near-field spectroscopy of metamaterial resonators
Degl’Innocenti, R; Lu, Y; Hale, LL; Zaman, AM; Addamane, SJ; Brener, I; Mitrofanov, O (IOP Publishing, 2024-03-01) -
Ultrafast modulation of a THz metamaterial/graphene array integrated device
Zaman, AM; Saito, Y; Lu, Y; Kholid, FN; Almond, NW; Burton, OJ; Alexander-Webber, J; Hofmann, S; Mitchell, T; Griffiths, JDP (2022-08-29)We report on the ultrafast modulation of a graphene loaded artificial metasurface realized on a SiO2/Si substrate by near-IR laser pump, detected via terahertz probe at the resonant frequency of ∼0.8 THz. The results have ... -
Versatile and active THz wave polarization modulators using metamaterial/graphene resonators
Zaman, AM; Lu, Y; Almond, NW; Burton, OJ; Alexander-Webber, J; Hofmann, S; Mitchell, T; Griffiths, JDP; Beere, HE; Ritchie, DA (Frontiers Media, 2023-01-31)Active modification of the polarization state is a key feature for the next-generation of wireless communications, sensing, and imaging in the THz band. The polarization modulation performance of an integrated metamateri ...