| AVS 58th Annual International Symposium and Exhibition | |
| Nanometer-scale Science and Technology Division | Monday Sessions |
| Session NS-MoA |
| Session: | Frontiers in Nanophotonics and Plasmonics |
| Presenter: | Rosa Alejandra Lukaszew, College of William and Mary |
| Authors: | L. Wang, College of William and Mary C. Clavero, College of William and Mary K. Yang, College of William and Mary A. Nelson, College of William and Mary K. Carroll, Virginia Commonwealth University Z. Huba, Virginia Commonwealth University E. Carpenter, Virginia Commonwealth University D. Gu, Applied Research Center R.A. Lukaszew, College of William and Mary |
| Correspondent: | Click to Email |
Magnetic transition nanoparticles (NPs) have been developed and studied by many researchers for bio-imaging and bio-sensing applications [1,2] due to their special optical and magneto-optical (MO) properties. Nevertheless, it is possible to enhance the MO effects of the magnetic NPs by combining them with other materials such as noble metals which exhibit intense localized surface plasmon resonance (LSPR) under certain conditions[3,4]. Here, we present our investigations on LSPR enhanced MO effect in magnetic metal core-noble metal shell NPs, such as core-shell Fe-Ag and Co-Ag NPs. These systems present strong Faraday rotation due to LSPR, nevertheless differences are found among them due to their different optical properties. A blue-shift is experimentally observed in the optical and MO spectra peaks from Fe-Ag to Co-Ag NPs with similar Ag shell concentrations and constant NPs sizes. Also, the absorption and Faraday rotation spectra of Fe-Ag NPs are broader than those of Co-Ag NPs. We explain such differences by means of theoretical studies based on an adaptation of the Maxwell-Garnet model to core shell nanoparticles yielding an excellent agreement with the experimental results. The possibility to understand and tune the properties of core-shell nanoparticles reported here will have significant impact in photonic and plasmonic applications.
This work was financed by DARPA under a grant for the development of novel sensors for bio-defense.
[1] Gilles K. Kouassi and Joseph Irudayaraj, Anal. Chem., 2006, 78 (10), pp 3234–3241.
[2] Jae-Hyun Lee, Yong-Min Huh, Young-wook Jun, Jung-wook Seo, Jung-tak Jang, Ho-Taek Song, Sungjun Kim, Eun-Jin Cho, Ho-Geun Yoon, Jin-Suck Suh and Jinwoo Cheon, Nature Medicine , 2006, 13, pp 95–99.
[3] Lei Wang, Kaida Yang, Cesar Clavero, Andrew. J. Nelson, Kyler J. Carroll, Everett E. Carpenter, and Rosa. A. Lukaszew, J. Appl. Phys., 2010, 107, 09B303.
[4] Lei Wang, Cesar Clavero, Zachary Huba, Kyler J. Carroll, Everett E. Carpenter, Diefeng Gu and Rosa A. Lukaszew, Nano Lett.,2011, 11(3), pp1237–1240.