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Flexible Transient Optical Waveguides and Surface‐Wave Biosensors Constructed from Monocrystalline Silicon
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Wubin Bai Hongjun Yang Yinji Ma Hao Chen Jiho Shin Yonghao Liu Quansan Yang Irawati Kandela Zhonghe Liu Seung‐Kyun Kang Chen Wei Chad R. Haney Anlil Brikha Xiaochen Ge Xue Feng Paul V. Braun Yonggang Huang Weidong Zhou John A. Rogers 《Advanced materials (Deerfield Beach, Fla.)》2018,30(32)
Optical technologies offer important capabilities in both biological research and clinical care. Recent interest is in implantable devices that provide intimate optical coupling to biological tissues for a finite time period and then undergo full bioresorption into benign products, thereby serving as temporary implants for diagnosis and/or therapy. The results presented here establish a silicon‐based, bioresorbable photonic platform that relies on thin filaments of monocrystalline silicon encapsulated by polymers as flexible, transient optical waveguides for accurate light delivery and sensing at targeted sites in biological systems. Comprehensive studies of the mechanical and optical properties associated with bending and unfurling the waveguides from wafer‐scale sources of materials establish general guidelines in fabrication and design. Monitoring biochemical species such as glucose and tracking physiological parameters such as oxygen saturation using near‐infrared spectroscopic methods demonstrate modes of utility in biomedicine. These concepts provide versatile capabilities in biomedical diagnosis, therapy, deep‐tissue imaging, and surgery, and suggest a broad range of opportunities for silicon photonics in bioresorbable technologies. 相似文献
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Abstract The coupling efficiency between the fundamental modes of two different graded-index waveguides fabricated by ion exchange in the same glass substrate is calculated by numerical and variational methods. Waveguide parameters that allow the designer to achieve the maximum power transfer through the waveguide boundary are determined. A possible application to the design optimization of waveguide lenses is considered. 相似文献
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By using an analytical model and a finite element method, we investigate a new, very sensitive, superconducting traveling
wave photodetector made by a fiber waveguide, which includes two high index layers and an active superconducting layer. A comparison
with the corresponding superconducting box shaped waveguide shows that a larger width of the superconducting layer can be
used to obtain single degenerate hybrid mode HE
11. The real part of the propagation constants in the fiber is smaller in comparison with that of the box-shaped waveguide with
similar dimensions but the imaginary part of the propagation constant and the power absorption efficiency in superconducting
layer are comparable with those of the corresponding box-shaped waveguide. The confinement regimes of the light and the power
absorption efficiency in superconducting layer can be optimized by only acting on the fiber geometry. 相似文献
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V. A. Popescu N. N. Puscas G. Perrone 《Journal of Superconductivity and Novel Magnetism》2010,23(7):1235-1239
A very sensitive superconducting traveling wave photodetector made of a modified box-shaped waveguide, which includes two high index layers and an active superconducting layer, is studied. The optical propagation constants and the power absorption efficiency for guided modes are determined using the finite element method; the results show that by acting only on the waveguide geometry, different confinement regimes of the light in the absorption superconducting layer can be achieved and optimized. 相似文献
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Hagen Renner 《Journal of Modern Optics》2013,60(5):907-915
Abstract Simple general formulae for the coupling coefficients of the fundamental modes on well-separated parallel optical waveguides are derived. The calculation merely requires accurate knowledge of the propagation constants and core fields of the modes on the individual waveguides, while the far-from-core fields need not be known. Results for coupled circular fibres are identical with the asymptotic expansions of previously derived exact coupling coefficients. Analytical expressions for the coupling coefficients between the fundamental modes on identical weakly guiding channel waveguides are obtained. 相似文献
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光波导端面的表面质量会严重影响光波导器件的光耦合封装性能,耦合封装前必须对波导器件端面进行抛光处理.目前聚合物光波导端面主要依靠传统研磨盘进行抛光处理,该工艺工序复杂、抛光效率低已成为制约聚合物波导器件应用的瓶颈.基于聚合物光波导材料优良的加工特性,通过对比实验提出了聚合物光波导的磁流变端面抛光工艺.采用5μm、0.5μm和1μm粒径的氧化铈抛光粉分别配制研磨盘抛光液及磁流变抛光液对3 mm×3 mm聚合物光波导端面进行抛光实验,发现磁流变加工对聚合物光波导端面进行一次2 m in光栅扫描抛光就具有比传统研磨盘约3 h精、粗抛光较好的端面质量.经过白光干涉仪测量,磁流变抛光后光波导端面表面粗糙度的均方根值达到了2.6 nm,传统端面抛光端面粗糙度均方根值为128.7 nm.通过自动对准耦合平台测试,结果显示通过磁流变端面抛光的光波导的插入损耗由抛光前的32.7 dB降低到了17.8 dB.磁流变抛光方法可以对聚合物光波导端面进行快速、高性能的抛光,在光波导应用领域具有非常广阔的应用前景. 相似文献
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