Fano resonances in nanoscale plasmonic systems the giannini. Plasmonic optical trapping is widely applied in the field of bioscience, microfluidics, and quantum optics. Fano resonance, plasmoncis, symmetry breaking, nanodisk, plasmon hybridization. Indeed, the study of the resonant mie scattering by a dielectric rod reveals46. To fully understand the origin behind this phenomenon it would be necessary to. Modern nanostructures offer a variety of optical systems where fano resonances can be realized 2,3. Currently, it is a challenge to obtain the highly stable optical trapping with low power and less damage. At last, the development and challenges of plasmonic sensing and modulation based on fano resonances are discussed. The fano and rabi models represent remarkably common effects in optics. Using hotspots in a singlestone ringlike structure arash ahmadivandn, raju sinha, serkan kaya, nezih pala department of electrical and computer engineering, florida international university, miami, fl 33174, usa. Nordlander p 2011 substrateinduced fano resonances of a plasmonic nanocube.
Pdf electrical modulation of fano resonance in plasmonic. Next, this thesis investigates a new class of waveguiding consisting of chains of fused heptamer nanodiscs. A molecular plasmonic fanorouter using hotspots in a single. A simple oscillator model is provided to predict and fit the farfield scattering. Pdf effects of fano resonance on optical chirality of. The excitation of the fano resonance is interpreted in terms of coupling of the ring and the dualdisk plasmonic modes. Mueller matrix spectroscopy of fano resonance in plasmonic. A system with a fano resonance displays at most one temporal beat under pulsed excitation, whereas a system in the rabi regime may have any. Martin nanophotonics and metrology laboratory, swiss federal institute of. Grady4, xing zhu1,2 1 school of physics, state key laboratory for mesoscopic physics, peking university, beijing 100871, china 2 national center for nanoscience and technology, beijing 100190, china 3 beijing national laboratory for condensed matter physics and institute of physics, chinese academy of. Tuning multiple fano resonances for onchip sensors in a. It can play a vital role to extend optical manipulation tools from micrometer to nanometer scale level.
A variety of fano resonant nanostructures ranging from periodic planar arrays to simple clusters. The proposed design involves a circular disk embedding an elongated cavity. By considering the plasmonic resonance in the fano model, as opposed to previous flat continuum. Ultracompact highsensitivity plasmonic sensor based on fano. The fano resonance is in principle the interference between two resonant modes of distinct lifetimes.
After proof of principle demonstration with bowtie antennas 4, we investigated the tunability of fano resonances in dolmen structure shown in fig. We will then also show that this enables experimental observation of a fano resonance. The increased asymmetry of the eot profile with decreasing aperture size, the second observation, is linked to diminished coupling of spps and lsps, leading to spectral narrowing of the fano resonance linewidth. A molecular plasmonic fanorouter using hotspots in a. Mechanisms of fano resonances in coupled plasmonic systems. Wangc, victor liuc, zhenqiang mab,nn, shanhui fanc,nnn adepartment of electrical engineering, university of texas at arlington, arlington, tx 76019, usa. In this paper, we propose fano resonance assisted selfinduced backaction.
Despite precedent works, we demonstrate theoretically and experimentally that fano resonances can be obtained by destructive interference between two bright dipolar modes out of phase. The interaction between plasmonic resonances, sharp modes, and light in nanoscale plasmonic systems often leads to fano interference effects. This occurs because the plasmonic excitations are usually spectrally broad and the characteristic narrow asymmetric fano lineshape results upon interaction with spectrally sharper modes. Fanolike plasmon resonances on a variety of complex nanostructures. Since the gear breaks the symmetric distribution of the resonance, fano resonance occurs in the gearshaped nanocavity. As a result, fano resonances are generated in the visible spectrum due to the destructive interference between the subradiant. Graphene, fano resonance, plasmonics, tunable resonances p. In this paper, we propose a periodically repeated ringdisk complementary structure to break the nearfield diffraction limit via plasmonic fano resonance, originating from the interference between the complex hybrid plasmon resonance and the continuum of propagating waves through the silver film. The fano resonance of a single symmetry broken ag nanodisk under a normal incidence was investigated by using finitedifference timedomain fdtd. Upon increasing the width of the double rectangular cavities simultaneously, the fano resonance peak blue shifted and its transmittance decreased, and the sensitivity decreased.
Fano resonance based on metalinsulatormetal waveguide. More recently, the fano resonance and dip of the external interference of two or more coupled plasmonic nanostructures, such as a dimer of two nanorods, have been studied 1016. Fano resonances, plasmonics, localized surface plasmons, plasmon hybridization, nanoantennas, fano theory. Through the fano resonance, the electromagnetic energy can be trapped in the so called dark mode and induce strong local field enhancement. Keywords plasmon, fano resonance, nanocluster, coherent phenomena, localized surface plasmon resonance lspr, sensing. In the dolmen structure overlap of dipolar and quadrupolar modes leads to a fano resonance, and hence we expect large enhancement associated with a dark mode. Magnetically controlled atomic plasmonic fano resonances.
Fano resonanceinduced negative optical scattering force. Pdf fano resonance in dualdisk ring plasmonic nanostructures. Plasmonics, polarization, oligomers, darkfield microscopy, mueller matrix. We will then also show that this enables experimental observation of a fano resonance in a di. Such lsprs are mainly characterized by large scattering and. In plasmonics, fano resonances arise from the interaction between a localized dark mode and a radia tive bright mode. Tailoring the plasmonic fano resonance in metallic photonic crystals. Fano resonance in dualdisk ring plasmonic nanostructures. Symmetry breaking of a metallic ring is realized by placing two disks inside the ring.
A c xxxx american chemical society plasmonic systems unveiled by fano resonances yan francescato, vincenzo giannini, and stefan a. Plasmonic clusters can support fano resonances, where the line shape characteristics are controlled by cluster geometry. A dualdisk ring ddr structure with broken symmetry and weakly dissipating material, silver, is proposed to achieve fano resonance in visible wavelength range. The fano effect fe is a characteristic property of two interacting oscillators 1. Fano resonance is a unique phenomenon which is based on quantum interference effect. Since its discovery, the asymmetric fano resonance has been a characteristic feature of interacting quantum systems.
Miniaturizing optical devices with desired functionality is a key prerequisite for nanoscale photonic circuits. Osa influence of fano resonance on sers enhancement in fano. Enhanced figure of merit in fano resonance based plasmonic. Polarization dependent fano resonance in a metallic. Pier online investigation of fano resonances induced by. In this method, we determined the appropriate geometrical sizes for the necklace based on fano resonance behavior. Fano resonance in mdm plasmonic waveguides coupled with split. Fano resonance in a gearshaped nanocavity of the metal. When this structure is incorporated into an uniquely. Recently, the fano resonance has been found in plasmonic nanoparticles, photonic crystals, and electromagnetic metamaterials. The coupling strength of the interfering spps and lsps plays an important role in determining the fano resonance linewidth. Optical fano resonance of an individual semiconductor. Osa influence of fano resonance on sers enhancement in.
Analytical description of fano resonances in plasmonic nanostructures benjamin gallinet and olivier j. Fano resonance in plasmonic optical antennas springerlink. This quantity is defined as the ratio of the total scattering crosssection and the geometrical crosssection, taken as the width of the stripe. 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 resonances in hybridized systems formed from the interaction of bright modes only are reported. Fano resonance effects take advantage of the coupling of these bound states with a continuum of radiative electromagnetic waves. Although, sensitivity is an important parameter of sensor to detect the. Pdf since its discovery, the asymmetric fano resonance has been a characteristic feature of interacting quantum systems. The established theoretical model agrees well with the finitedifference timedomain simulations, which reveals the physics of fano resonance. Fano resonant plasmonic systems nanophotonics and metrology lab. The asymmetric fano resonance originating from the interference of a narrow resonance with a broad spectra or continuum of states is a universal phenomenon, observed in diverse spectroscopic systems14. May 05, 2016 a fano resonance peak was observed in transmission spectra, and it depended on the mode coupling between the double rectangular cavities. Fano resonances and electromagnetically induced transparency. The fano resonance effect has attracted the attention of researchers due to its promising applications including biological and chemical sensing, electromagnetically induced transparency, slow light control.
The established theoretical model agrees well with the finitedifference timedomain simulations. Tuning fano resonances with graphene purdue engineering. Polarization dependent fano resonance in a metallic triangle. Maier the blackett laboratory, imperial college london, london sw7 2az, united kingdom one of the main features of plasmonics and also one of its greatest successes is the reshaping of a. Fanolike resonances arising from longlived molecule. Here, we report a structure supporting the coherent oscillation of two distinct fano resonances within an individual plasmonic nanocluster. Fano resonances in optics and microwaves physics and. Fano resonance in dualdisk ring plasmonic nanostructures article pdf available in optics express 1923. Augmenting second harmonic generation using fano resonances.
The use of fano resonant elements enhances the interaction of incident radiation with the graphene sheet and enables e. A plasmonic fano switch nano letters acs publications. The effects of fano resonance on the optical chirality of planar plasmonic nanodevices in the visible wavelength range are experimentally observed and theoretically explained. We demonstrate that these systems show fundamentally different dynamics. The coupling between surface plasmon polariton spp mode and. Fano resonanceassisted plasmonic trapping of nanoparticles. Nanophotonics and metrology laboratory, swiss federal institute of technology lausanne epfl, ch1015 lausanne, switzerland laboratory for micro and nanotechnology, paul scherrer institut, ch5232 villigenpsi, switzerland. Aug 23, 2010 the shape of this resonance is distinctively different from that of conventional symmetric resonance curves. The subradiant mode of fano resonance can result in significant nearfield enhancement due to its light trapping capability into the socalled hotspots. The shape of this resonance is distinctively different from that of conventional symmetric resonance curves. Jun 28, 2016 plasmonic optical trapping is widely applied in the field of bioscience, microfluidics, and quantum optics. Here we show that clusters with a hemicircular central disk surrounded by a circular ring of closely spaced, coupled nanodisks yield fano like and non fano like spectra for orthogonal incident polarization orientations. And the 1st order fano resonant peak, which is a standingwave mode, will split into two resonant peaks one standingwave mode and one travelingwave mode when it couples with the 2nd fano resonance.
Plasmonic fano resonance and dip of ausio2au nanomatryoshka. Plasmonic oligomers can provide profound fano resonance in their scattering responses. Pdf the fano resonance in plasmonic nanostructures and. Occurrence of both fano and induced transparency peaks is modulated by alteration of the nonlinear permittivity through an external control. The quick change of phase shift caused by two stubs induces a fano resonance. Also, the potential of the proposed fano system as an integrated slowlight device and refractive index sensor was investigated. Introduction metallic nanostructures support localized surface plasmon resonances lsprs at visible and nearinfrared wavelengths. Our approach can be used for development of next generation of tunable plasmonic and hybrid nanophotonic devices. Moreover, we also find that the sensitivity in the autio2 hybrid metasurface with the stubshaped defect can reach up to 330 nmriu and 535 nmriu at the fano resonance 1 and fano resonance 2.
Here we study the coherent time dynamics of plasmonic systems exhibiting fano and rabi resonances. This novel waveguiding structure transports electromagnetic energy via magnetic plasmon resonance mode. Published 21 february 2014 2014 iop publishing ltd journal of optics, volume 16, number 3. Analysis of asymmetry of fano resonance in plasmonic metal. Coherent fano resonances in a plasmonic nanocluster. Augmenting second harmonic generation using fano resonances in plasmonic systems krishnan thyagarajan, jere my butet, and olivier j. The nanodevice consists of a nanodisk at the center with surrounding six gold nanorods with an orientation angle to exhibit optical chirality under darkfield illumination. The fano resonance in plasmonic nanostructures and. Fano resonances have been studied for many resonant optical systems. Martin nanophotonics and metrology laboratory nam, swiss federal institute of technology lausanne epfl, 1015, lausanne, switzerland s supporting information. Fano resonance in novel plasmonic nanostructures request pdf.
It has been proved that the destructive interference between the bright dipole mode from al nanorod and the dark quadrupole mode from au nanorod nearby results in the appearance of apparent fano resonance in the extinction spectra. Analytical description of fano resonances in plasmonic. Fano resonance strongly depends on the structural parameters of the gear. Surface plasmons, as collective electrons oscillations at the interface between the metal and. Based on fano resonance, an onchip highsensitivity sensor, composed of two waveguides coupling with a symmetry breaking ring resonator, is theoretically and numerically investigated. Plasmonic fano resonances in compositional heterogenous al. It is also shown that fano resonance in necklace shape con. Nanofocusing beyond the nearfield diffraction limit via. For instance, when the plasmonic and atomic resonances coincide, one gets a peak in transmission, as is evident in the green line in figure 1c. Polarization dependent fano resonance in a metallic triangle embedded in split ring plasmonic nanostructures. On the basis of the proposed model, a circle and a ring cavity are separately added above the stubs to induce multiple fano resonances, and successfully, they can give triple and quadruple fano. The importance of the fano resonance concept is recognized across multiple fields of physics. A nano plasmonic sensor employing fano resonance in 1d nanogratings patterned on ultra thin ag films offers the sensing resolution of 1.
Fano resonances have immense potential for single particle localized surface plasmon sensing applications. To overcome such a limitation, in this paper, a waveguidecoupled spr configuration is proposed to work at nearinfrared. Fanoresonant plasmonic metamaterials and their applications. Fano resonances of plasmonic nanodisk zheyu fang1, junyi cai1, zhongbo yan1, nathaniel k. Wudeng wang, yudong li, jingyang peng, zongqiang chen, jun qian, jing chen, jingjun xu and qian sun. Electrical modulation of fano resonance in plasmonic. Recently, the fano resonance has been found in plasmonic nanoparticles, photonic. Fano resonances in a plasmonic waveguide system composed. This chapter describes an analytical model developed to study the fano resonance effect in clusters of spherical plasmonic nanoparticles under local excitation. By considering the plasmonic resonance in the fano model, as. Progress in 2d photonic crystal fano resonance photonics. Pdf fano resonances of plasmonic nanodisk nathaniel.
In the phasesensitivitybased surface plasmon resonance spr sensing scheme, the highest phase jump usually happens at the darkness or quasidarkness reflection point, which results in low power for detection. Fano resonance results from the coherent interference between a narrow discrete state and a wide continuous spectrum, which is useful for the integrated optical devices. In this paper, fano resonance in some ultra compact metaldielectricmetal mdm plasmonic waveguides is studied in detail. We observe electrically controlled damping in the fano resonances occurring at approximately 2. We have investigated theoretically the plasmon resonance coupling in compositional heterogenous alau nanorod dimers organized in a close proximity by endtoend. In general, the fano resonance occurs when a discrete quantum. Jan 14, 2019 quantum interference effects, namely fano resonance producing asymmetric resonant excitation and plasmoninduced transparency pit, are demonstrated in a plasmonic waveguidecoupled resonator device incorporated with a thirdorder kerr nonlinear medium. In contrast, when the plasmonic resonance is detuned from the figure 1. Martin nanophotonics and metrology laboratory, swiss federal institute of technology lausanne epfl, 1005. The fano resonance in plasmonic nanostructures and metamaterials. One o scillator in a fano system should exhibit a narrow absorption resonance and the other one sho uld be strongly damped. Request pdf fano resonance in novel plasmonic nanostructures recently, a large number of experimental and theoretical works have revealed a variety of.
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