TY - JOUR
T1 - Fundamental and high-order anapoles in all-dielectric metamaterials via Fano–Feshbach modes competition
AU - Gongora, J. S. Totero
AU - Favraud, Gael
AU - Fratalocchi, Andrea
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2017/2/1
Y1 - 2017/2/1
N2 - One of the most fascinating possibilities enabled by metamaterials is the strong reduction of the electromagnetic scattering from nanostructures. In dielectric nanoparticles, the formation of a minimal scattering state at specific wavelengths is associated with the excitation of photonic anapoles, which represent a peculiar type of radiationless state and whose existence has been demonstrated experimentally. In this work, we investigate the formation of anapole states in generic dielectric structures by applying a Fano-Feshbach projection scheme, a general technique widely used in the study of quantum mechanical open systems. By expressing the total scattering from the structure in terms of an orthogonal set of internal and external modes, defined in the interior and in the exterior of the dielectric structure, respectively, we show how anapole states are the result of a complex interaction among the resonances of the system and the surrounding environment. We apply our approach to a circular resonator, where we observe the formation of higher-order anapole states, which are originated by the superposition of several internal resonances of the system.
AB - One of the most fascinating possibilities enabled by metamaterials is the strong reduction of the electromagnetic scattering from nanostructures. In dielectric nanoparticles, the formation of a minimal scattering state at specific wavelengths is associated with the excitation of photonic anapoles, which represent a peculiar type of radiationless state and whose existence has been demonstrated experimentally. In this work, we investigate the formation of anapole states in generic dielectric structures by applying a Fano-Feshbach projection scheme, a general technique widely used in the study of quantum mechanical open systems. By expressing the total scattering from the structure in terms of an orthogonal set of internal and external modes, defined in the interior and in the exterior of the dielectric structure, respectively, we show how anapole states are the result of a complex interaction among the resonances of the system and the surrounding environment. We apply our approach to a circular resonator, where we observe the formation of higher-order anapole states, which are originated by the superposition of several internal resonances of the system.
UR - http://hdl.handle.net/10754/622894
UR - http://iopscience.iop.org/article/10.1088/1361-6528/aa593d/meta;jsessionid=106845CF98C266D8795D369681C1FC83.c1.iopscience.cld.iop.org
UR - http://www.scopus.com/inward/record.url?scp=85013141430&partnerID=8YFLogxK
U2 - 10.1088/1361-6528/aa593d
DO - 10.1088/1361-6528/aa593d
M3 - Article
C2 - 28145277
SN - 0957-4484
VL - 28
SP - 104001
JO - Nanotechnology
JF - Nanotechnology
IS - 10
ER -