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Novel Routes Toward Manipulating Light Via Active and Passive Metasurfaces.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Novel Routes Toward Manipulating Light Via Active and Passive Metasurfaces./
作者:	Forouzmand, Seyedali.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	230 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-02, Section: B.
Contained By:	Dissertations Abstracts International82-02B.
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27837848
ISBN:	9798664716801

Novel Routes Toward Manipulating Light Via Active and Passive Metasurfaces.
Forouzmand, Seyedali.

Novel Routes Toward Manipulating Light Via Active and Passive Metasurfaces. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 230 p.

Source: Dissertations Abstracts International, Volume: 82-02, Section: B.

Thesis (Ph.D.)--Northeastern University, 2020.

This item must not be sold to any third party vendors.

The traditional optical lenses which have been widely used in industry are bulky, curved, non-adjustable after fabrication, and having low spatial resolution. The field of optics has undergone a paradigm shift from traditional ray optics to metamaterial-based devices, and lately to planar metasurfaces as two dimensional representative of metamaterials. Graded-pattern metasurfaces can potentially offer high reflection/transmission efficiency, device miniaturization, planar form, high spatial resolution, and opportunity of dense integration into photonic/optic devices. In this dissertation, I present my efforts which have led to the design, analysis, and computational modeling of various kinds of passive metasurfaces (both plasmonic and all-dielectric) at near-infrared and visible regimes with the goal of achieving arbitrary control over the light beyond the limits of conventional lenses. The primarily goal of my project has been the reduction of size, weight, power, and cost (SWPaC), while novel or higher efficient optical performance can also be achieved. In this realm, my research can have a remarkable impact toward miniaturization of multilayer lenses. For example, an ultra-thin flat-top beam shaper is designed which has been conventionally realized with two cascaded bulky phase and focusing lenses. In addition, I have proposed an all-dielectric C-shaped metasurface which not only can offer ultimately high transmission level (>80%) and full phase pick-up (2π) but also has less dependency on the constituent material loss and dispersion in the visible regime. Subsequently, various functional space-variant C-element metasurfaces are modeled and computationally investigated for beam-scanning, focusing, holography, and flat-top beam generation. Next, a systematic design strategy is presented to develop a novel class of nanoantenna arrays exploiting the multilayer shared-aperture antenna concept. I utilized antenna theories including phased-array, antenna pattern synthesis, and mutual coupling reduction to realize multifunctional and multispectral reflect-array metasurfaces with minimized occupied physical area. The proposed multifunctional and multispectral flat optical platforms facilitate the efficient integration of multiple diversified functionalities into one single unltrathin nanoscale device which can be highly desired for wireless communications, remote sensing, radar systems, and airborne applications. The unique feature of my designs is the possibility of having access to super-distinct or super-close operating channels, while performing simultaneous beam manipulations.As more advanced designs, I have performed an in-depth research on metasurface-based antennas which not only can have optimized SWPaC, but also can offer real-time wide phase and amplitude modulation without any mechanically moving parts. These are ideal replacements for the large, heavy, and power-consuming conventional antennas which have low speed of scanning and limited range of tunability. Several novel methodologies and design principles are presented to realize tunable meta-devices capable of performing wide phase/amplitude modulation at near-infrared regime in particular at the telecommunication wavelength. The potential of wide phase/amplitude modulation can be leveraged for steering the beam propagation direction, shaping the wavefront (e.g., focusing and holography), and polarization state control. These electrically tunable metasurface-based antennas can pave the way toward wide range of technologies from wireless/satellite communications to imaging/sensing devices like LIDARs for autonomous vehicles and self-driving cars. In particular, I have developed several active plasmonic and all-dielectric designs for tunable single-band one dimensional beam manipulation, multifunctional dual-band operation, and polarization-insensitive single-band two dimensional wave-front control, using indium tin oxide-integrated metal-insulator-metal, metal-insulator-semiconductor, and semiconductor-insulator-semiconductor nanostructures. A roadmap toward efficiency improvement of tunable nanoantenna metasurfaces and introducing novel functionalities/applications for this class of nanoantenna arrays are presented through utilizing recently emerged tunable materials like transparent conducting oxides, chalcogenide phase-change materials, and doped-semiconductors. The compactness, short response time, and higher efficiency provided by my proposed metalenses help to improve current sensing, imaging, and information transfer technologies.

ISBN: 9798664716801Subjects--Topical Terms:

596380
Electrical engineering.
Subjects--Index Terms:

Electro-optical platforms

Novel Routes Toward Manipulating Light Via Active and Passive Metasurfaces.
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300 $a 230 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-02, Section: B.
500 $a Advisor: Mosallaei, Hossein.
502 $a Thesis (Ph.D.)--Northeastern University, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a The traditional optical lenses which have been widely used in industry are bulky, curved, non-adjustable after fabrication, and having low spatial resolution. The field of optics has undergone a paradigm shift from traditional ray optics to metamaterial-based devices, and lately to planar metasurfaces as two dimensional representative of metamaterials. Graded-pattern metasurfaces can potentially offer high reflection/transmission efficiency, device miniaturization, planar form, high spatial resolution, and opportunity of dense integration into photonic/optic devices. In this dissertation, I present my efforts which have led to the design, analysis, and computational modeling of various kinds of passive metasurfaces (both plasmonic and all-dielectric) at near-infrared and visible regimes with the goal of achieving arbitrary control over the light beyond the limits of conventional lenses. The primarily goal of my project has been the reduction of size, weight, power, and cost (SWPaC), while novel or higher efficient optical performance can also be achieved. In this realm, my research can have a remarkable impact toward miniaturization of multilayer lenses. For example, an ultra-thin flat-top beam shaper is designed which has been conventionally realized with two cascaded bulky phase and focusing lenses. In addition, I have proposed an all-dielectric C-shaped metasurface which not only can offer ultimately high transmission level (>80%) and full phase pick-up (2π) but also has less dependency on the constituent material loss and dispersion in the visible regime. Subsequently, various functional space-variant C-element metasurfaces are modeled and computationally investigated for beam-scanning, focusing, holography, and flat-top beam generation. Next, a systematic design strategy is presented to develop a novel class of nanoantenna arrays exploiting the multilayer shared-aperture antenna concept. I utilized antenna theories including phased-array, antenna pattern synthesis, and mutual coupling reduction to realize multifunctional and multispectral reflect-array metasurfaces with minimized occupied physical area. The proposed multifunctional and multispectral flat optical platforms facilitate the efficient integration of multiple diversified functionalities into one single unltrathin nanoscale device which can be highly desired for wireless communications, remote sensing, radar systems, and airborne applications. The unique feature of my designs is the possibility of having access to super-distinct or super-close operating channels, while performing simultaneous beam manipulations.As more advanced designs, I have performed an in-depth research on metasurface-based antennas which not only can have optimized SWPaC, but also can offer real-time wide phase and amplitude modulation without any mechanically moving parts. These are ideal replacements for the large, heavy, and power-consuming conventional antennas which have low speed of scanning and limited range of tunability. Several novel methodologies and design principles are presented to realize tunable meta-devices capable of performing wide phase/amplitude modulation at near-infrared regime in particular at the telecommunication wavelength. The potential of wide phase/amplitude modulation can be leveraged for steering the beam propagation direction, shaping the wavefront (e.g., focusing and holography), and polarization state control. These electrically tunable metasurface-based antennas can pave the way toward wide range of technologies from wireless/satellite communications to imaging/sensing devices like LIDARs for autonomous vehicles and self-driving cars. In particular, I have developed several active plasmonic and all-dielectric designs for tunable single-band one dimensional beam manipulation, multifunctional dual-band operation, and polarization-insensitive single-band two dimensional wave-front control, using indium tin oxide-integrated metal-insulator-metal, metal-insulator-semiconductor, and semiconductor-insulator-semiconductor nanostructures. A roadmap toward efficiency improvement of tunable nanoantenna metasurfaces and introducing novel functionalities/applications for this class of nanoantenna arrays are presented through utilizing recently emerged tunable materials like transparent conducting oxides, chalcogenide phase-change materials, and doped-semiconductors. The compactness, short response time, and higher efficiency provided by my proposed metalenses help to improve current sensing, imaging, and information transfer technologies.
590 $a School code: 0160.
650 4 $a Electrical engineering. $3 596380
653 $a Electro-optical platforms
653 $a Electromagnetics
653 $a Metamaterials
653 $a Metasurfaces
653 $a Nano-optics and photonics
653 $a Optical antennas
690 $a 0544
710 2 $a Northeastern University. $b Electrical and Computer Engineering. $3 1182193
773 0 $t Dissertations Abstracts International $g 82-02B.
790 $a 0160
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27837848