Sadeghi S M, Hood B, Patty K D, Mao C-B
Department of Physics, University of Alabama in Huntsville, Huntsville, Alabama, 35899, USA.
J Phys Chem C Nanomater Interfaces. 2013 Aug 20;117(33):17344-17351. doi: 10.1021/jp405651b.
We use quantum coherence in a system consisting of one metallic nanorod and one semi-conductor quantum dot to investigate a plasmonic nanosensor capable of digital optical detection and recognition of single biological molecules. In such a sensor the adsorption of a specific molecule to the nanorod turns off the emission of the system when it interacts with an optical pulse having a certain intensity and temporal width. The proposed quantum sensors can count the number of molecules of the same type or differentiate between molecule types with digital optical signals that can be measured with high certainty. We show that these sensors are based on the ultrafast upheaval of coherent dynamics of the system and the removal of coherent blockage of energy transfer from the quantum dot to the nanorod once the adsorption process has occurred.
我们利用由一根金属纳米棒和一个半导体量子点组成的系统中的量子相干性，来研究一种能够对单个生物分子进行数字光学检测和识别的等离子体纳米传感器。在这种传感器中，当特定分子吸附到纳米棒上并与具有一定强度和时间宽度的光脉冲相互作用时，系统的发射就会被关闭。所提出的量子传感器可以通过能够高度精确测量的数字光学信号来计数相同类型分子的数量，或者区分不同类型的分子。我们表明，这些传感器基于系统相干动力学的超快剧变以及吸附过程发生后量子点到纳米棒的能量转移相干阻塞的消除。
