Plasmonic external cavity laser refractometric sensor.
Plasmonic external cavity laser refractometric sensor.
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DOI：
10.1364/oe.22.020347
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发表时间：
2014-08
期刊：
影响因子：
3.8
通讯作者：
Meng Zhang;M. Lu;C. Ge;B. T. Cunningham
中科院分区：
文献类型：
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作者：
Meng Zhang;M. Lu;C. Ge;B. T. Cunningham
将表面等离子体共振折射率传感的高灵敏度特性与可调谐外腔激光器相结合，我们展示了用于高分辨率折射率传感的等离子体外腔激光器（ECL）。等离子体激元ECL利用具有异常光透射（EOT）的等离子体激元晶体作为波长选择元件，并且在EOT共振的透射峰处实现单模激光。该等离子体激元ECL折射传感器保持了等离子体激元晶体传感器的高灵敏度，同时通过激光发射提供了窄的光谱线宽，从而为利用有源或无源光学谐振器的折射感测带来了创纪录的高品质因数。我们演示了电泵浦激光系统的单模和连续波操作，并展示了测量折射率变化的能力，3σ检测限为1.79 × 10（-6）RIU。所展示的方法是一个有前途的路径，以增强信噪比的小分子药物发现和病原体传感的挑战性应用的无标记光学生物传感。
Combining the high sensitivity properties of surface plasmon resonance refractive index sensing with a tunable external cavity laser, we demonstrate a plasmonic external cavity laser (ECL) for high resolution refractometric sensing. The plasmonic ECL utilizes a plasmonic crystal with extraordinary optical transmission (EOT) as the wavelength-selective element, and achieves single mode lasing at the transmission peak of the EOT resonance. The plasmonic ECL refractometric sensor maintains the high sensitivity of a plasmonic crystal sensor, while simultaneously providing a narrow spectral linewidth through lasing emission, resulting in a record high figure of merit for refractometric sensing with an active or passive optical resonator. We demonstrate single-mode and continuous-wave operation of the electrically-pumped laser system, and show the ability to measure refractive index changes with a 3σ detection limit of 1.79 × 10(-6) RIU. The demonstrated approach is a promising path towards label-free optical biosensing with enhanced signal-to-noise ratios for challenging applications in small molecule drug discovery and pathogen sensing.