Fano-like resonance from disorder correlation in vacancy-doped photonic crystals
Entity
UAM. Departamento de Física de MaterialesPublisher
WileyDate
2023-10-04Citation
10.1002/smll.202302355
Small 40.4 (2023): 2302355
ISSN
1613-6810 (print); 1613-6829 (online)DOI
10.1002/smll.202302355Funded by
PID2021-124814NB-C21, PGC2018-095777-B-C22, PID2019-109905GA-C22, CEX2018-000805-M, UAM-CAM project (SI1/PJI/2019-00052)Project
Goberno de España. PID2021-124814NB-C21; Gobierno de España. PGC2018-095777-B-C22; Gobierno de España. PID2019-109905GA-C22; Gobierno de España. CEX2018-000805-MEditor's Version
https://doi.org/10.1002/smll.202302355Subjects
Optical Correlation; Reflection; Spectral Range; Disorder; FísicaRights
© 2023 The AuthorsEsta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
By preparing colloidal crystals with random missing scatterers, crystals are created where disorder is embodied as vacancies in an otherwise perfect lattice. In this special system, there is a critical defect concentration where light propagation undergoes a transition from an all but perfect reflector (for the spectral range defined by the Bragg condition), to a metamaterial exhibiting an enhanced transmission phenomenon. It is shown that this behavior can be phenomenologically described in terms of Fano-like resonances. The results show that the Fano's parameter q experiences a sign change signaling the transition from a perfect crystal exhibiting a reflectance Bragg peak, through a state where background scattering is maximum and Bragg reflectance reaches a minimum to a point where the system reenters a low scattering state recovering ordinary Bragg diffraction. A simple dipolar model considering the correlation between scatterers and vacancies is proposed and the reported evolution of the Fano-like scattering is explained in terms of the emerging covariance between the optical paths and polarizabilities and the effect of field enhancement in photonic crystal (PhC) defects
Files in this item
Google Scholar:Pariente, Jose Angel
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Bayat, Farzaneh
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Blanco, Alvaro
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García-Martín, Antonio
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Pecharromán, Carlos
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Marqués Ponce, Manuel Ignacio
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López, Cefe
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