Photonic coupled systems between on-chip integrated microresonator and core-shell nanoparticle
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Photonic coupled systems between on-chip integrated microresonator and core-shell nanoparticle Y. Xiong1, P. Pignalosa2, and Y. Yi1,2* 1 2
University of Michigan, MI Massachusetts Institute of Technology, Cambridge, MA
ABSTRACT We have numerically investigated the unique effects of the core-shell nanoparticles on the integrated micro disk resonator. By attaching the core-shell nanoparticle to the disk resonator with gold core and polymer shell, the coupling between the disk resonator and the core-shell nanoparticle results in shift of the resonance wavelength of the disk resonator, depending on the core size/shell thickness of the nanoparticle. An ‘invisibility’ phenomenon found from the coupled core-shell nanoparticle and integrated disk resonator system is emphasized: at certain core size/shell thickness ratio, compared to the original resonance wavelength without core-shell nanoparticle, there is almost no resonance wavelength shift observed. The dependence of the position and number of core-shell nanoparticles is also discussed. Future studies on this coupled photonic systems will stimulate wide variety of applications. *e-mail: [email protected]
INTRODUCTION With the rapid development of nanotechnology and nano fabrication techniques [1], nanoparticles are known for their unique photonic properties in the visible and near-infrared wavelength regions and have been widely employed in a variety of widespread applications in biomedicine, sensing, thin film solar cells and solid state lighting [2]–[8]. The fascinating electronic and optical properties of nanoparticles, such as localized surface plasmon resonance with metallic nanoparticles and scattering phenomenon of dielectric nanoparticles, have attracted worldwide attention to study more deeply on their structures and interaction with optoelectronic devices. Core-shell nanoparticle is a new class of nanoparticles which has multiple layer structures, typically with either metal material (Au or Ag) as core layer, and one dielectric material (SiO2, Si3N4, or Polymer, etc.) as out shell cladding layer, or vice versa. Core-shell nanoparticles with more than two layers, multilayer metal-dielectric nano cups, have also been proposed recently with very interesting properties on plasmon hybridization and field confinement [9]. Due to its unique structures with combination of both metallic and dielectric materials in a single entity, core-shell nanoparticles have been widely used in biomedical applications (e.g. vitro cell labeling), plasmonics, lighting emitting diodes, lasers and display [3]. The flexibility to change the core size or the shell layer thickness enables us to have the ability to control some of the fundamental electronic, photonic and mechanical properties of this type of core-shell nanoparticles, as well as their interactions with other integrated micro or nano scale optoelectronics materials and devices. In this work, we choose the Au as core, and polymer as the cladding shell layer. When the size of the metal core is zero, the core-shell nanoparticle
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