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  • 學位論文

利用全反射衰減法量測金奈米粒子之等效光學常數

The equivalent optical constants of gold nanoparticles measured by attenuated total reflection method

指導教授 : 任貽均

摘要


本文主要在探討金奈米粒子的光學特性。實驗的部份,利用浸泡方式一方面使用不同直徑的金奈米粒子吸附在金膜表面;另一方面針對同ㄧ種直徑的金奈米粒子,改變不同的浸泡時間以控制金膜表面上的表面密度,並利用全反射衰減儀及橢偏儀的方法量測。 針對以上兩種金膜表面粒子的變因,使用表面電漿共振方法來量測金奈米粒子的光學常數。不同以往將金奈米粒子層以均向的折射率及消光係數視之,本研究以非均向性為前提量測金奈米粒子的非均向光學特性。而由表面電漿共振所量到的全反射衰減曲線,藉分析全反射衰減曲線在各種不同的金奈米粒子狀況下之最小共振角及半寬度的變化,可以了解奈米粒子在金膜表面所造成的光學擾動程度。

並列摘要


The Kretschmann configuration that 10 to 40 nm diameter colloidal Au on the surface of Au film are arranged to excite surface plasmon. It is found that the surface roughness on the gold film can be equivalent the gold particles distribution to have the same shifting and broadening of attenuated total reflection (ATR) curve compared with the ATR curve for the bare gold film. The equivalent root-mean-square (RMS) roughness heights and optical constants for various size and surface density distributions are derived from the measured ATR curves.

並列關鍵字

Gold nanoparticles SPR ellipsometry anisotropic

參考文獻


【1】H. Raether, “Surface plasmons on smooth and rough surfaces and on gratings, “ Springer-Verlag, Berlin, 1988.
【2】E. Kretschmann, H. Raether, “Radiative decay of non-radiative surface plasmons excited by light,” Z. Naturforsch., 23A, pp.2135–2136, 1968
【3】A. Otto, “Excitation of surface plasma waves in silver by the method of frustrated total reflection,” Z. Physik, 216, pp.398–410, 1968
【4】J. Homola, “Surface plasmon resonance sensors: review,” Sensors and Actuators B, 54, pp.3-15, 1999
【5】M.J. O’Brien, V.H. Perez-Luna, “A surface plasmon resonance array biosensor based on spectroscopic imaging,” Biosensors and Bioelectrons, 16, pp.97-108, 2001

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