Bledt Carlos M, Melzer Jeffrey E, Harrington James A
School of Engineering, Rutgers University, Piscataway, New Jersey 08854, USA.
Appl Opt. 2013 Jun 1;52(16):3703-12. doi: 10.1364/AO.52.003703.
Silver/silver halide-coated hollow-glass waveguides (HGWs) are capable of low-loss, broadband transmission at infrared wavelengths with the advantage of optical response tunability through alteration of a number of key design parameters. Generally, the design of circular HGWs has primarily involved optimization of the waveguide bore size and deposited film structure in order to obtain the desired optical response, with the waveguide bore size being held constant as a function of length. In this study, the effects of HGW structures consisting of linearly tapered inner diameters on the optical response at infrared wavelengths are theoretically and experimentally investigated. Theoretical analysis involving numerical ray optics methods accounting for the dynamic nature of bore size, and consequently light propagation, along the waveguide length is presented and compared to experimental results in order to gain a deeper understanding of these atypical HGW structures.
涂覆有银/卤化银的中空玻璃波导（HGW）能够在红外波长下进行低损耗、宽带传输，并且具有通过改变一些关键设计参数来实现光学响应可调谐的优点。通常，圆形HGW的设计主要涉及优化波导孔径尺寸和沉积膜结构，以获得所需的光学响应，其中波导孔径尺寸作为长度的函数保持恒定。在本研究中，理论和实验研究了具有线性渐变内径的HGW结构对红外波长光学响应的影响。提出了涉及数值光线光学方法的理论分析，该方法考虑了沿波导长度的孔径尺寸以及光传播的动态特性，并与实验结果进行比较，以便更深入地了解这些非典型的HGW结构。
