tailieunhanh - Synthesis and optical characterization of building block plasmonic gold nanostructures

The results show that the AuNPs exhibited a single plasmonic resonance, the AuNRs displayed two identical and separated modes of the resonance, and the random Au nano-islands presented a very broad resonance. Specifically, tailoring the anisotropy of the Au nanorods enabled extending their resonant frequencies from the visible to the near infrared region, which is in accordance with the finite different time domain simulations. | Communications in Physics, Vol. 27, No. 2 (2017), pp. 131-141 DOI: SYNTHESIS AND OPTICAL CHARACTERIZATION OF BUILDING-BLOCK PLASMONIC GOLD NANOSTRUCTURES OANH THI TU NGUYEN, CHI HA LE, LONG DUY PHAM, HIEU SY NGUYEN AND CHUNG VU HOANG † Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet street, Cau Giay district, Hanoi, Vietnam † E-mail: chunghv@ Received 07 April 2017 Accepted for publication 14 June 2017 Published 30 June 2017 Abstract. Plasmonics, the field involves manipulating light at the nanoscale, has been being an emergent research field worldwide. Synthesizing the plasmonic gold nanostructures with controlled morphology and desired optical properties is of special importance towards specific applications in the field. Here, we report the chemical synthesis and the optical properties of various plasmonic Au nanostructures, namely Au nanoparticles (AuNPs), Au nanorods (AuNRs) and random Au nano-islands (AuNI) that are the building blocks for plasmonic research. The results show that the AuNPs exhibited a single plasmonic resonance, the AuNRs displayed two identical and separated modes of the resonance, and the random Au nano-islands presented a very broad resonance. Specifically, tailoring the anisotropy of the Au nanorods enabled extending their resonant frequencies from the visible to the near infrared region, which is in accordance with the finite different time domain simulations. Keywords: Plasmonics, chemical synthesis, optical property, nanoparticles, nanorods, random nano-islands. Classification numbers: , , , , . c 2017 Vietnam Academy of Science and Technology 132 SYNTHESIS AND OPTICAL CHARACTERIZATION OF BUILDING-BLOCK PLASMONIC . I. INTRODUCTION The interaction of light with the metal nanostructures opens up plasmonics, an emergent field which is multidisciplinary and involves many different subjects such as .