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20 April 2010 PCF with immobilized silver nanoparticles as an optofluidic SERS sensing platform
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The unique feature of photonic crystal fiber (PCF) both as a light guide and a liquid transmission cell allows synergistic integration of optics and microfluidics to form an unconventional optofluidic platform of long interaction path limited only by the fiber length. We report the strategy and methods in realizing full-length surface-enhanced Raman scattering (SERS) PCF optofluidics by immobilization of negatively charged Ag nanoparticles (NP) through polyelectrolyte-mediated approach or direct deposition of positively charged Ag NP on the PCF air channels. Through forward propagating Raman measurements, we demonstrate the full-length SERS-active PCF optofluidics with accumulative Raman signal gain along the entire fiber length. We show SERS measurements of 1x10-7 M (~48 ppb) Rhodamine 6G and 1x10-8 M (~0.8 ppb) sodium thiocyanate in a minute volume of ~10-7-10-8 liter aqueous solution using PCF with immobilized Ag NP over ~20 cm in length. The combination of high detection sensitivity and small sampling volume renders the SERS-active PCF optofluidic platform excellent potential for a multitude of applications ranging from label-free chemical and biological sensing to process monitoring in geometrically confined systems.
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Yun Han, Siliu Tan, Maung Kyaw Khaing Oo, and Henry Du "PCF with immobilized silver nanoparticles as an optofluidic SERS sensing platform", Proc. SPIE 7677, Fiber Optic Sensors and Applications VII, 767710 (20 April 2010);

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