Studies On Localized Surface Plasmon Resonance Effect And Selective Liquid-filled Photonic Crystal Fiber

The localized surface plasmon resonance (LSPR) is an important optical propertyof the metal nanoparticles. It relates to the refractive index of the surrounding dielectrics.LSPR is widely used in chemical and biological detection because of this property.Taking use of the selectively liquid-filled technique, the air holes of photonic crystalfiber provide an ideal space for the interaction of light and sample. With this technique,a vary of sense and detection experiment based on PCF can be carried on. LSPR effectand selectively liquid-filled photonic crystal fiber are investigated in this thesis. Theprimary contents are presented as follows:1. LSPR of metal nanoparticles of the temperature dependence is simulated. Thesimulation results show that resonance wavelength of the mixture of gold colloidsincreases by1367pm when the temperature increases from20℃to60℃, and itstemperature sensitivity is34pm/K. The calculation of the temperature dependence of thedielectric function of metal is modified.2. The effects of concentrations of the mixture of gold colloids-dimethylsulfoxide(DMSO) on LSPR are studied. The empirical formula fit for calculating therefractive index of the mixture is chosen by comparing the simulate results of severalclassical models. The refractive indexes of different concentrations of the mixture ofgold colloids-DMSO in different temperature are measured, and the LSPR absorptionspectrums of different concentrations of the mixture of gold colloids-DMSO aremeasured. The measurement results show that resonance wavelength of the mixture ofgold colloids increases by8.5×103pm when the concentrations increase from0%to100%.3．An effective and convenience liquid-filled device is made，taking use of thecontrolled air hole collapse technique, we can achieve the selectively liquid-filledphotonic crystal fiber. The transmission characteristics and mode of radially hybridphotonic crystal fiber is simulated. The simulation results show that the radially HPCFhas bandgap effect which is similar to photonic crystal fiber. The factor which effectsthe bandgap of radially HPCF is studied.4. The Raman scattering spectrums of DMSO which is selectively filled in the sixinnermost air holes are measured. The temperature character of the radially HPCF isanalyzed, and further to confirm the existence of the bandgap in radial HPCF. Thesurface enhanced Raman scattering can be studied with radially HPCF by filled goldcolloids.