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SHEET TYPE METAMATERIAL AND SHEEET TYPE LENS

Foreign code F180009336
File No. S2016-0487-C0
Posted date Mar 13, 2018
Country WIPO
International application number 2017JP004381
International publication number WO 2017150098
Date of international filing Feb 7, 2017
Date of international publication Sep 8, 2017
Priority data
  • P2016-038296 (Feb 29, 2016) JP
Title SHEET TYPE METAMATERIAL AND SHEEET TYPE LENS
Abstract This sheet type metamaterial has a first wire array 10 formed on the front surface of a film-like dielectric substrate 12 and a second wire array 11 formed on the back surface of the dielectric substrate 12. The first wire array 10 is constituted of long, thin metal first cut wire 10a of a length l at a spacing g along the direction of the y axis and a spacing s along the direction of the x axis, and a second wire array 11 is constituted of a second cut wire 11a in a symmetrical disposition with the same shape so as to overlap the first cut wire 10a. When the design frequency is 0.51 THz, the thickness d of the dialectic substrate is 50 µm, spacing s is approximately 361 µm, spacing g is approximately 106 µm, and length l for the first cut wire 10a and the second cut wire 11a is a length substantially resonant at the frequency used. Thus, a sheet type metamaterial with an index of refraction of zero can be obtained.
Outline of related art and contending technology BACKGROUND ART
Dielectric constant, magnetic permeability of the medium when light is incident to both negative, negative refraction occurring is indicated by beserago, negative magnetic permeability and dielectric constant of the artificial structure has been proposed. Of the magnetic permeability and dielectric constant of the artificial structure is negative, the scale of the wavelength of light is sufficiently larger than the atoms of the structure and assembly is less than, is called a metamaterial. Negative refractive medium using a metamaterial, the full-planar configuration can be created in the lens. Is a full lens, exceeds the diffraction limit to the fine and can be observed, to the near-field (evanescent wave) can be reproduced faithfully.
Metamaterial, attention has recently been applied to the lens of a terahertz wave can be. The terahertz wave, the frequency (wavelength 30 μm-3000 μm) 0.1-10THz and an electromagnetic wave of, far-infrared wavelength region approximately coincides with a millimeter-wave -, 'light' and 'millimeter' between the present frequency domain. Thus, the terahertz wave, as similar to the light with high spatial resolution and the ability to distinguish, the same substance as the millimeter wave transmission are both an ability. To the terahertz wave band electromagnetic wave but this is not the analyte, this frequency band in the time domain by utilizing the characteristics of the electromagnetic wave spectrum, imaging and tomography of a material such as application to characterization have been studied. The generation of the terahertz wave, and the straightness of the transparent material for both safety and innovative X-ray imaging or in alternative, the number of class 100Gbps and an ultra-high speed wireless communication can be possible.
In particular, the terahertz imaging, X-ray instead of the safety, ease and high accuracy of visualization techniques have major attractiveness as one 1. Break through the diffraction limit by near-field terahertz nano imaging or, the resolution is 1.4THz 400nm (1 wavelength/540) can be obtained have been reported. In addition, a resonant tunneling diode may be used in 0.3THz imaging have been reported. A negative refractive index metamaterial can be designed, a near-field light and the evanescent component is restored at a remote location, exceeding the diffraction limit can be realized a full lens plate is.
The applicant, Japanese Patent Application 2015-16116 filed in the terahertz wave band with low loss and a negative refractive index can be obtained with the proposed metamaterial sheet type, Japanese Patent Application 2015-154943 filed in the terahertz wave band with low loss and high refractive index is obtained by forming a sheet-type metamaterial is proposed. In addition, the refractive index of the metamaterial obtained is zero has been proposed (see non-patent document 1). The refractive index of the obtained zero conceptual diagram of a conventional metamaterial 100 shown in 21. 100 Is a metamaterial shown in Fig. 21, dielectric 111 and metal 110 are stacked periodically and with the periodic structure. The metamaterial is, a specific frequency in the case of (critical state), the effective refractive index becomes zero. Zero in the index of refraction material, the phase advancement is not, in other words the light is as shown in a series of peaks and valleys proceeds space, not scheduling engine moves as a wave. Index of refraction material instead of the stationary phase is zero, all of the valley and mountain all, to infinitely long wavelength. The peaks and valleys, not the space, time to vibrate only as a variable. This uniform phase can, without loss of optical energy, extends and shrinks, the twisting or bending. For this reason, as shown in Fig. 100 light enters from the upper surface with respect to the metamaterial, the metamaterial 100 does not change in phase is propagated at a constant phase (the phase velocity is set to infinity).
Scope of claims (In Japanese)[請求項1]
フィルム状の誘電体基板と、
該誘電体基板の一面に形成された第1ワイヤーアレーと、
前記誘電体基板の他面に形成された第2ワイヤーアレーとを備え、
前記第1ワイヤーアレーは、間隔gを空けて前記誘電体基板のy軸方向に、間隔sを空けてy軸と直交するx軸方向に並べられて配列された所定長lの細長い金属製の第1カットワイヤーにより構成され、前記第2ワイヤーアレーは、前記第1カットワイヤーと同形状で前記第1カットワイヤーに重なるように対称配置されて配列された金属製の第2カットワイヤーにより構成されており、
設計周波数を0.51THzとした時に、前記誘電体基板の厚さdを約50μm、前記間隔sを約361μm、前記間隔gを約106μm、前記第1カットワイヤーおよび前記第2カットワイヤーの長さlを使用周波数においてほぼ共振する長さとすることを特徴とするシート型メタマテリアル。
[請求項2]
多数の単位セルが整列してフィルム状の誘電体基板に形成されているシート型レンズであって、
前記単位セルは、該誘電体基板の一面に形成された所定長lの細長い金属製の第1カットワイヤーと、前記第1カットワイヤーと同形状で前記誘電体基板の他面に形成された金属製の第2カットワイヤーとにより構成され、
前記誘電体基板の一面には、前記単位セルの前記第1カットワイヤーがy軸方向に間隔gを空けると共に、y軸方向に直交するx軸方向に間隔sを空けて配列され、
前記誘電体基板の他面には、前記単位セルの前記第2カットワイヤーがy軸方向に間隔gを空けると共に、y軸方向に直交するx軸方向に間隔sを空けて配列され、
前記第1カットワイヤーおよび前記第2カットワイヤーの長軸がy軸方向にほぼ平行に配列されており、前記誘電体基板の領域が、中央部から外縁までのn領域に分割され、最も内側の第1領域R1の屈折率が正、最も外側の第n領域Rnの屈折率が負とされ、前記第1領域R1と前記第n領域Rnとの間の所定の領域Rkの屈折率がゼロとされて、前記第1領域R1から前記第n領域Rnに向かうに従って屈折率が次第に小さくされていることを特徴とするシート型レンズ。
[請求項3]
前記第1領域R1ないし前記領域Rkまでの領域においては、前記第1カットワイヤーと前記第2カットワイヤーとが重なるよう対称配置され、前記領域Rkの次の領域R(k+1)から前記第n領域Rnまでの領域においては、前記第1カットワイヤーと前記第2カットワイヤーとがy軸方向にずらせて重なるよう非対称配置されていることを特徴とする請求項2に記載のシート型レンズ。
[請求項4]
所定の屈折率を得るために、前記第1カットワイヤーおよび前記第2カットワイヤーにおける幅w、前記所定長l、前記間隔s、前記間隔gの寸法が、前記第1領域ないし前記第n領域において、調整されていることを特徴とする請求項2に記載のシート型レンズ。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • IBARAKI UNIVERSITY
  • Inventor
  • SUZUKI TAKEHITO
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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