Lee Jin Hyoung, Wu Qi, Park Wounjhang
Department of Electrical and Computer Engineering, University of Colorado, Boulder, Colorado 80309, USA.
Opt Lett. 2009 Feb 15;34(4):443-5. doi: 10.1364/ol.34.000443.
A new bottom-up approach for fabricating the optical metamaterial is reported. An array of metal nanoparticle clusters can provide both electric and magnetic activity in the optical frequency region through the excitation of the collective plasmon resonance. A two-dimensional square array of gold nanoparticle clusters (nanoclusters) was fabricated by using the template-directed colloidal self-assembly. The optical measurements showed strong extinction peaks in the near-infrared region owing to the electric resonance supported by the nanoclusters. The peak positions were in excellent agreement with the numerical simulations. The metal nanocluster metamaterial represents a promising new architecture for an optical metamaterial that can be fabricated by a scalable bottom-up fabrication technique.
报道了一种用于制造光学超材料的新型自下而上的方法。金属纳米粒子团簇阵列可通过集体等离子体共振的激发在光频区域提供电和磁活性。通过模板导向的胶体自组装制备了二维方形金纳米粒子团簇（纳米团簇）阵列。光学测量表明，由于纳米团簇支持的电共振，在近红外区域出现了强烈的消光峰。峰位置与数值模拟结果非常吻合。金属纳米团簇超材料代表了一种有前途的新型光学超材料结构，可通过可扩展的自下而上制造技术来制造。
