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Extrinsically 2D-Chiral Metamirror in Near-Infrared Region
ACS Photonics ( IF 6.5 ) Pub Date : 2020-01-13 , DOI: 10.1021/acsphotonics.9b01211 Libang Mao 1 , Kuan Liu 1 , Shuang Zhang 2 , Tun Cao 1
ACS Photonics ( IF 6.5 ) Pub Date : 2020-01-13 , DOI: 10.1021/acsphotonics.9b01211 Libang Mao 1 , Kuan Liu 1 , Shuang Zhang 2 , Tun Cao 1
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Many previously observed strong chiroptical effects are limited to chiral metamaterials with complex three-dimensional building blocks. Recently, chiral metamirrors consisting of planar elements are proposed to selectively reflect one particular circularly polarized light (CPL) while absorbing the other, with the reflected one either preserving or altering its spin state. However, they are limited by complicated subwavelength chiral profiles of their unit cells, which are challenging to fabricate in the visible-near-infrared (NIR) region. We present an extrinsically chiral metamirror that reflects one CPL preserving its handedness while strongly absorbing the other, reaching a circular conversion dichroism (CCD) in reflectance as large as 0.43 in the NIR region. Our polarization-conserving mirror possesses an Au pillar array and a continuous Al film separated by a SiO2 dielectric layer, where the Au pillars are periodically arranged by a rectangular lattice. The rather simple geometry of mirror significantly simplifies its fabrication in the high frequency region. The pronounced CCD originates from a chiral triad of the achiral resonator array and light’s propagation direction. Such a chiral mirror provides an efficient methodology toward handedness-selective modulation of the CPL and finds applications in planar photonic devices such as molecular spectroscopy, quantum information, and polarimetric imaging.
中文翻译：
近红外区域的外在二维手性元镜
许多以前观察到的强手性效应仅限于具有复杂三维构造块的手性超材料。近来，提出了由平面元件组成的手性元镜，以选择性地反射一种特定的圆偏振光（CPL），同时吸收另一种，其中反射的一种保持或改变其自旋状态。然而，它们受到其晶胞的复杂的亚波长手性谱的限制，这很难在可见-近红外（NIR）区域制造。我们提出了一种外在手性元镜，该镜面反射了一个CPL保留了它的惯用性，同时又强烈地吸收了另一个，在NIR区域中反射率达到了0.43，达到了圆形转换二向色性（CCD）。2个介电层，其中Au柱由矩形晶格周期性排列。反射镜的相当简单的几何形状大大简化了其在高频区域的制造。明显的CCD来自非手性共振器阵列的手征三元组和光的传播方向。这种手性镜为CPL的手控选择性调制提供了一种有效的方法，并在诸如分子光谱，量子信息和极化成像等平面光子器件中找到了应用。
更新日期：2020-01-14
中文翻译：
近红外区域的外在二维手性元镜
许多以前观察到的强手性效应仅限于具有复杂三维构造块的手性超材料。近来，提出了由平面元件组成的手性元镜，以选择性地反射一种特定的圆偏振光（CPL），同时吸收另一种，其中反射的一种保持或改变其自旋状态。然而，它们受到其晶胞的复杂的亚波长手性谱的限制，这很难在可见-近红外（NIR）区域制造。我们提出了一种外在手性元镜，该镜面反射了一个CPL保留了它的惯用性，同时又强烈地吸收了另一个，在NIR区域中反射率达到了0.43，达到了圆形转换二向色性（CCD）。2个介电层，其中Au柱由矩形晶格周期性排列。反射镜的相当简单的几何形状大大简化了其在高频区域的制造。明显的CCD来自非手性共振器阵列的手征三元组和光的传播方向。这种手性镜为CPL的手控选择性调制提供了一种有效的方法，并在诸如分子光谱，量子信息和极化成像等平面光子器件中找到了应用。
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