对称金属包覆结构中反射光干涉效应的研究.pdfVIP

37 12 Vol. 37,No. 12 2010 12 CHINESEJOURNAL OF LASERS December, 2010 :2010) 对称金属包覆结构中反射光干涉效应的研究 * 陈 麟 彭 滟 袁明辉 朱亦鸣 ( , 200093) , , , , , , 100% ;; ;; O484.5 A doi: 10. 3788/CJ 3145 Investigation of Interference Fringes of R eflected Beam on Double MetalCladding Structure Chen Lin Peng Yan Yuan inghui ZhuYiming ( School of Optical lectrical and Computer ngineering , University of Shanghai for Science and Technology , Shanghai 200093, China ) Abstract A double metalcladding structurewhich canachieve high contrast approaching unity and highreflectivity is proposed. This double metalcladding structure with submillimeter scale can accommodate a series of resonant modes. Using the Fresnel reflection formula of the four layers, the relationship between coupling efficiency and thicknessof upper metal layer is analyzed and the optimum value of thickness of upper metal layer can also be obtained. It is also found that such optimum value is closely related to the intrinsic and radiative damping. The interference fringes of reflected beam and coupling efficiency on double metalcladding structure were observed experimentally. Experimental results showedthathighcontrast approaching unity can be observedfrom interference fringes and coupling efficiency can reach nearly 100% on double metalcladding structure. It is useful for the investigationof highcontrast highreflectivity films and the sensors basedon double metalcladding structure. Key words waveguide; interference fringes; attenuatedtotal reflection; coupling efficiency; doubl