Chen, Hsuen-LiHsuen-LiChenCheng, Hsu-ChunHsu-ChunChengKo, Tsung-ShineTsung-ShineKoChuang, Shang-YuShang-YuChuangChu, Tien-ChiTien-ChiChu2008-12-312018-06-282008-12-312018-06-28200600214922http://ntur.lib.ntu.edu.tw//handle/246246/95624https://www.scopus.com/inward/record.uri?eid=2-s2.0-33749028690&doi=10.1143%2fJJAP.45.6984&partnerID=40&md5=86036812523ab46edb1c305c67d7dd4fIn this study, the optical constants of gold nanoparticles are evaluated for surface plasmon-based sensor applications. Using an effective medium approximation (EMA) and ellipsometry, approaches to monitor the self-assembly of gold nanoparticles are also demonstrated. Spectroscopic ellipsometric parameters measured (tan Ψ, cos Δ) before and after adding gold nanoparticles to a substrate are used to calculate the optical constants of gold nanoparticles. The film thickness is measured by grazing incidence X-ray reflectivity (XRR). The optical constants (refractive index, extinction coefficient) of gold nanoparticles can be obtained from the measured ellipsometric parameters and thickness. We also show that particles density can be well predicted and detected nondestructively by this method. © 2006 The Japan Society of Applied Physics.application/pdf201930 bytesapplication/pdfen-USEllipsometric parameters; Gold-nanoparticles; Optical constants; Self-assembly; Surface plasmon resonanceApproximation theory; Ellipsometry; Gold; Optical systems; Self assembly; Surface plasmon resonance; Effective medium approximation (EMA); Gold nanoparticles; Optical constants; X ray reflectivity (XRR); Nanostructured materialsjournal article10.1143/JJAP.45.69842-s2.0-33749028690http://ntur.lib.ntu.edu.tw/bitstream/246246/95624/1/26.pdf