This book discusses the development of Fano-based techniques and reveals the characteristic properties of various wave processes by studying interference phenomena. It explains that the interaction of discrete (localized) states with a continuum of propagation modes leads to Fano interference effects in transmission, and explores novel coherent effects such as bound states in the continuum accompanied by collapse of Fano resonance.

Originating in atomic physics, Fano resonances have become one of the most appealing phenomena of wave scattering in optics, microwaves, and terahertz techniques. The generation of extremely strong and confined fields at a deep subwavelength scale, far beyond the diffraction limit, plays a central role in modern plasmonics, magnonics, and in photonic and metamaterial structures. Fano resonance effects take advantage of the coupling of these bound states with a continuum of radiative electromagnetic waves. With their unique physical propertiesand unusual combination of classical and quantum structures, Fano resonances have an application potential in a wide range of fields, from telecommunication to ultrasensitive biosensing, medical instrumentation and data storage. Including contributions by international experts and covering the essential aspects of Fano-resonance effects, including theory, modeling and design, proven and potential applications in practical devices, fabrication, characterization and measurement, this book enables readers to acquire the multifaceted understanding required for these multidisciplinary challenges.

Autorentext

Dr. EUGENE O. KAMENETSKII received his diploma of Engineer in Electrical Engineering and the PhD degree in Physics and Mathematics from the Electrical Engineering Institute, St. Petersburg, Russia, in 1969 and 1986, respectively. He is presently with Ben Gurion University of Negev, Israel as a Head of Microwave Magnetic Laboratory. He is an author (co-author) of 150 refereed journal and conference papers. He was an Editor of the Review Book: "Electromagnetic, magnetostatic, and exchange-interaction vortices in confined magnetic structures", Research Signpost Publisher, Kerala, 2008. He is a Fellow of the Electromagnetics Academy (USA) since 2007. His special fields of scientific interests are magnetic waves and oscillations, spectral theory of artificial atomic structures, metamaterials for microwave and optics applications, microwave microscopy, and microwave biosensing.Prof. ALMAS SADREEV, graduated Kazan State University in 1971 in Theoretical Physics, received the First Doctor degree in 1974 in Kazan State University. Since 1994 he is the head of Lab. of Theory of Nonlinear Processes, Kirensky Institute of Physics, Federal Research Center KSC SB RAS. Got Honorous Causa Doctor 2002 Linkoping University, Sweden.

A/Prof ANDREY MIROSHNICHENKO obtained his PhD in 2003 from the Max-Planck Institute for Physics of Complex Systems in Dresden, Germany. In 2004 he moved to Australia to join the Nonlinear Physics Centre at ANU. During this time A/Prof Miroshnichenko made fundamentally important contributions to the field of photonic crystals and bringing the concept of the Fano resonances to photonics. In 2007 A/Prof Miroshnichenko was awarded by Australian Postdoctoral Fellowship from the Australian Research Council. It allowed him to initiate the research on a new class of tunable photonic structures infiltrated with liquid crystals. Later, in 2011 he was awarded by Future Fellowship from the Australian Research Council. During this period he pioneered the research of high-index dielectric nanoparticles in the visible range, including one of the first demonstrations of the optically induced magnetic response in silicon nanoparticles. In 2017 he has moved to the University of New South Wales Canberra and got very prestigious Scientia Fellowship. The current topics of his research are nonlinear nanophotonics, topologiccal photonics, and resonant interaction of light with nanoclusters, including optical nanoantennas and metamaterials.

Inhalt

1. LINEAR AND NONLINEAR DYNAMICS OF FANO RESONANCES IN PLASMONIC STRUCTURES COUPLED TO QUANTUM EMITTERS

Mehmet Emre Tasgin Institute of Nuclear Sciences, Hacettepe University, 06800 Ankara, Turkey

metasgin@hacettepe.edu.tr

Fano resonances manifest novel phenomena both in linear and nonlinear response of plasmonicnano-materials. They can extend the lifetime of plasmonic excitations, enabling the operation nanolasers, or they can increase the fluorescence of quantum emitters. They also provide control over nonlinear optical processes such as second harmonic generation and four-wave mixing. Fano resonances can both enhance or suppress nonlinear response. Interference of two or more absorption/conversion paths is responsible for the appearance of these effects. In this Chapter, we demonstrate explicitly -on a single equation- how path interference takes part in linear and nonlinear Fano resonances.

Keywords: L ifetime, second harmonic generation, four-wave mixing

2. FANO-RESONANT EXCITATIONS OF GENERALIZED OPTICAL SPIN WAVES

Xianji Piao*, Sunkyu Yu, Minpyo Lee, and Namkyoo Park

Photonic Systems Laboratory, Department of ECE, Seoul National University, Seoul 08826, Korea

• xjpiao227@gmail.com

While chiral or gyrotropic materials possess spinor 'wavefunctions' as their eigenvectors, optical spin 'observables' cannot be obtained in those materials due to the lack of spinor impedances. Additional non-conservative functions are thus required for deriving spin observables, such as circular dichroism or magneto-optical effects. In this chapter, a conservative approach for achieving optical spin will be described, by exploiting Fano spectral-separation of optical spins. Starting from spinor temporal coupled mode theory for 2D/3D chiral resonances, the origin of spin-Fano interactions is demonstrated: the link between spinor eigenvectors in the polarization domain and anti-symmetric Fano resonances in the spectral domain. Compared with chiral, gyrotropic, and birefringent materials, novel applications of this spin-Fano resonance are discussed toward optical spintronics: including highly-selective spin switching and unpolarized operations.

Keywords: optical spin, anti-symmetric Fano resonance, optical spintronics

3. MUELLER MATRIX APPROACH FOR ENGINEERING ASYMMETRIC FANO-RESONANCE LINE SHAPE IN AN ANISOTROPIC OPTICAL SYSTEM

S.K. Ray, S. Chandel, A.K. Singh, P. Mitra, and N. Ghosh*

Indian Institute of Science Education and Research (IISER) Kolkata, India - 741246

*nghosh@iiserkol.ac.in

The asymmetric Fano resonance originating from the interference of a narrow resonance with a broad spectral line or continuum of states is a universal phenomenon, observed in diverse quantum and classical sy stems. The Fano resonances observed in micro and nano optical systems have received particular attention due to their numerous potential applications like in sensing, switching, lasing, filters and robust color display, nonlinear and slow-light devices, invisibility cloaking, and so forth. Most of the aforementioned applications are known to critically depend upon the ability to control or modulate the asymmetry of the spectral line shape by external means. Thus, tuning the Fano resonance via some experimentally accessible parameters are highly desirable for realistic applications. In this chapter, we discuss a new concept based on polarization Mueller matrix analysis for tuning the Fano interference effect and the resulting asymmetric spectral line shape in anisotropic optical system. The approach is founded on a generalized model of anisotropic Fano resonance and exploits the different polarization response (anisotropy) of the two interfering modes to achieve unprecedented control over Fano resonance. Illustrative results on the use of the model for tuning Fano resonance in waveguidedplasmonic crystals are presented.…