Department of Electrical and Computer Engineering, Western University, London, ON, Canada.
Nanotechnology. 2013 Nov 22;24(46):465502. doi: 10.1088/0957-4484/24/46/465502. Epub 2013 Oct 24.
To improve the limit of detection in a nanoplasmonic sensor system, the optical performance of the metal nanostructures should be optimized according to the best spectral window of the measurement instrument. We propose that the spectral window from 1460 to 1610 nm can potentially provide ultrahigh instrumental resolution for biosensing. We optimized gold nanoring arrays such that the extinction peak position is inside the proposed window, the extinction peak is sharp enough to track the peak shift with high resolution and the figure of merit (sensitivity/linewidth) of the array is optimized at the same time. The peak-sharpening effect of the array caused by coherent interaction plays a central role in the optimization. The optimized array has a lattice constant in the range [1000 nm,1060 nm], a bulk index sensitivity of around 450 nm/RIU and a figure of merit larger than 4. It is an enabling sensor element for a near-infrared sensor chip with ultrahigh resolution.
为了提高纳米等离子体传感器系统的检测极限，应根据测量仪器的最佳光谱窗口优化金属纳米结构的光学性能。我们提出，1460 至 1610nm 的光谱窗口可能为生物传感提供超高仪器分辨率。我们对金纳米环阵列进行了优化，使得消光峰位置位于所提出的窗口内，消光峰足够陡峭，能够以高分辨率跟踪峰值移动，同时优化了阵列的品质因数（灵敏度/线宽）。相干相互作用引起的阵列峰锐化效应在优化中起着核心作用。优化后的阵列具有[1000nm，1060nm]范围内的晶格常数、约 450nm/RIU 的体折射率灵敏度和大于 4 的品质因数。它是具有超高分辨率的近红外传感器芯片的一种有前途的传感器元件。
