摘要
表面等离子体激元是局域在金属表面的一种由自由电子和光子相互作用形成的混合激发态.改变金属表面的结构,SPPs与光相互作用的特性也会随之改变.所以,SPPs在光存储、光激发、显微技术和生物光子学等领域的应用受到日益关注.首先,介绍了SPPs的基本特性和表面等离子体亚波长光学研究热点,然后用微加工的手段制备了亚波长的环形和分形结构的样品,并用实验测量和传输矩阵的方法得出两级cross dipole分形结构在近红外和中红外的透过曲线,在1.72μm和5.2μm的波长处有两个强的透过峰,其透过率分别为36%和49%,理论和实验结果一致.
Surface plasmons are waves that true of a metal＇s surface, the propeties of can be tailored, which offers the potential propagate along the surface of metal. By altering the struc- surface plasmons-in particular their interacction with lightfor developing new types of photonic device. Surface plasmons are being explored for their potential in subwavelength optics, data storge, light generation, microscopy and bio-photonics. The samples we used in this paper were fabricated by electron beam lithography and reactive ion etching system. The periodic arrays of cross dipole fractal slits of two stages, exhibit two excellent pass bands in the near-and mid-infrared region. Numerical simulations by using a transfer matrix method reproduce quite well the observed transmission spectrum.
出处
《北京工商大学学报（自然科学版）》
CAS
2009年第1期42-46,共5页
Journal of Beijing Technology and Business University:Natural Science Edition
基金
国家973计划项目(2007CB310403)
关键词
亚波长光学
表面等离子体
分形结构
subwavelength optics
surface plasmons
fractal structure
