Optical bistability in plasmonic nanoparticles: Effect of size,shape and embedding medium |
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| Institution: | 1. Centro de Investigación en Materiales Avanzados, S.C. (CIMAV), Chihuahua/Monterrey, 120 Avenida Miguel de Cervantes, 31109 Chihuahua, Mexico;2. Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV) Querétaro, Libramiento Norponiente 2000, Fracc. Real de Juriquilla, 76230 Querétaro, Mexico;3. Chernivtsi National University, Kotsyubynsky Str. 2, 58012 Chernivtsi, Ukraine;1. Department of Physics, Dilla University, Dilla, Ethiopia;2. Department of Physics, Addis Ababa University, Addis Ababa, Ethiopia;1. School of Physics and Information Technology, Shaanxi Normal University, Xi''an 710062, China;2. Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA;3. Teaching and Research Section of Physics, Foundation Department, Engineering University of CAPF, Xi''an 710086, China;1. Department of Physics, University of Isfahan, Hezar Jerib, 81746-73441 Isfahan, Iran;2. Quantum Optics Research Group, University of Isfahan, Isfahan, Iran |
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| Abstract: | We theoretically investigate the optical bistability, which one input signal allows two possible outputs, from single spherical/cylindrical nanoparticles and also nanoshells in the frame work of quasi-static formalism. It is shown that the bistability behavior greatly depends on several parameters such as the nanoparticle size, material and the surrounding dielectric environment. We demonstrated the width of the bistability region and also the bistable threshold depends on the geometrical parameters, and can be tuned by adjusting the size of nanoparticle, the shell thickness and the dielectric constant of the embedding medium. It is also shown that the optical bistable behavior depends strongly on the shape of plasmonic nanoparticles and nanoshells. However, these dependences of optical bistability of spherical/cylindrical nanoparticles and nanoshells on changing of their geometrical parameters can be used for realize optical switching and sensing purposes. |
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| Keywords: | Optical bistability Plasmonic nanoparticle Nanoshell |
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