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    • 63. 发明专利
    • Electromagnetic wave radiation element and method of manufacturing the same
    • 电磁波辐射元件及其制造方法
    • JP2013130609A
    • 2013-07-04
    • JP2011278188
    • 2011-12-20
    • Ngk Insulators Ltd日本碍子株式会社
    • KONDO JUNGOIWATA YUICHIEJIRI TETSUYA
    • G02F1/39G02B1/11G02B1/118
    • H01S5/0604G02F1/3534G02F2201/30G02F2201/38G02F2203/13
    • PROBLEM TO BE SOLVED: To provide an element which allows a terahertz wave to be radiated with high efficiency from a high-refractive-index crystal such as a LN single crystal to an outside.SOLUTION: An electromagnetic wave radiation element 1 comprises: a body 7 made of nonlinear optical crystal; and a sub-wavelength lattice structure 5 formed on the body 7. The sub-wavelength lattice structure 5 includes: protrusions 2 arranged regularly on the body 7 in a first direction X and a second direction Y; and a first and a second groove 3X and 3Y provided between the adjacent protrusions 2 and extending toward X and Y. Each of the protrusions 2 has a pair of first surfaces 2c and 2d opposing in the X-direction, and a pair of second surfaces 2a and 2b opposing in the Y-direction. A width of the first surfaces becomes smaller in the direction from the body 7 to a top edge 2e of the protrusion, and a width of the second surfaces becomes smaller in the direction from the body 7 to the top edge 2e of the protrusion. The first groove has a curved surface when viewed in cross section in a width direction, and the second groove has a curved surface when viewed in cross section in a width direction.
    • 要解决的问题:提供一种允许以高效率从诸如LN单晶的高折射率晶体向外部照射太赫兹波的元件。解决方案:电磁波辐射元件1包括:主体 7由非线性光学晶体制成; 亚波长晶格结构5包括:在主体7上沿第一方向X和第二方向Y规则地布置的突起2; 以及设置在相邻突起2之间并朝向X和Y延伸的第一和第二槽3X和3Y。每个突起2具有在X方向上相对的一对第一表面2c和2d以及一对第二表面 2a和2b在Y方向上相对。 第一表面的宽度在从主体7到突起的顶部边缘2e的方向上变小,并且第二表面的宽度在从主体7到突起的顶部边缘2e的方向上变小。 当在宽度方向的横截面中观察时,第一凹槽具有弯曲表面,并且当在宽度方向上的横截面中观察时,第二凹槽具有弯曲表面。
    • 70. 发明公开
    • ADJUSTABLE OPTICAL ATTENUATOR
    • EINSTELLBARER OPTISCHERDÄMPFER
    • EP3139208A4
    • 2017-06-21
    • EP14893120
    • 2014-10-22
    • HUAWEI TECH CO LTD
    • MAO CHONGCHANGLI MINCHUNMIN HONG
    • G02F1/29
    • G02F1/292G02B27/30G02F1/1393G02F1/29G02F2201/30G02F2201/34G02F2203/07
    • Embodiments of the present invention provide a variable optical attenuator. The variable optical attenuator includes: a collimator, a switchable polarization grating, a reflector, and a voltage controller for adjusting a voltage between electrodes at both ends of a liquid crystal layer of the switchable polarization grating, where the collimator, the switchable polarization grating, and the reflector are disposed successively; the collimator is configured to receive incident light and output the incident light to the switchable polarization grating; the switchable polarization grating is configured to diffract the incident light for one time and then perform emission onto the reflector; the switchable polarization grating is further configured to diffract, for one time, a beam reflected back by the reflector, and then emit resulting diffracted light; and the collimator is further configured to receive the diffracted light and output the diffracted light. The variable optical attenuator provided in the embodiments of the present invention has an extremely wide dynamically variable range, and is characterized by high reliability, a small size, and a low cost.
    • 本发明的实施例提供了一种可变光衰减器。 可变光衰减器包括:准直器,可切换偏振光栅,反射器以及电压控制器,用于调节可切换偏振光栅的液晶层两端的电极之间的电压,其中准直器,可切换偏振光栅, 和反射器依次设置; 准直器被配置为接收入射光并将入射光输出到可切换偏振光栅; 可切换偏振光栅被配置为衍射入射光一次,然后发射到反射器上; 可切换偏振光栅还被配置为衍射一次由反射器反射回来的光束,然后发射所产生的衍射光; 准直仪还被构造成接收衍射光并输出衍射光。 本发明实施例提供的可变光衰减器具有极宽的动态可变范围,具有可靠性高,体积小,成本低的特点。