Fano Resonance in a Gear-Shaped Nanocavity of the Metal–Insulator–Metal Waveguide

Sharp Asymmetric Line Shapes in a Plasmonic Waveguide System and its Application in Nanosensor

“…1(d)]. It is very different from the previous reports that the Fano energy is dispersed in every resonators [13]- [16], [18], [19], [22], [26], [28], [30]- [35]. These properties make our structure more sensitive to the index variations compared with the previous reports [13], [22], [28], [30].…”

“…Therefore, combining the Fano-like response with MIM plasmonic structures would create the possibility of achieving ultracompact functional optical components for use in highly integrated optics [29]. The common characteristic of the papers reported about Fano resonances based on MIM waveguide system [13]- [16], [18], [19], [22], [26], [28], [30]- [35] is that the energy diffuses in every resonators, which makes the structures not very sensitive to the variation of refractive index of the material. Therefore, we need to find a new Fano forming structure, such that its energy can be concentrated mainly in a single resonator to obtain a high sensitivity of spectrum response to the index variations.…”

High Quality Plasmonic Sensors Based on Fano Resonances Created through Cascading Double Asymmetric Cavities

“…As we know, there has been remarkable progress in developing plasmonic nanostructures, such as surface-enhanced Raman spectroscopy [8], bio/chemical sensors [9,10,11,12], optical waveguides [13,14], lasers [15], absorbers [16], reflectors [17,18], and logic devices [19,20]. Recently, much attention has been given to plasmonic Fano resonances [21,22,23,24], which are classical analogues of the Fano resonance of a quantum system interfered with the discrete excited state of an atom with a continuous state. Different from Lorentz resonances (symmetric spectra), Fano resonances generally exhibit asymmetric lineshapes.…”

Liquid-crystal-based tunable plasmonic waveguide filters

“…Hence, some simple plasmonic waveguide filters have been proposed including ring resonators [23], tooth-shaped plasmonic waveguide filters [24], rectangular geometry resonators [25] and channel drop filters with disk resonators [26]. Most of them have the configuration of MIM waveguides coupled with a gear-shaped cavity [27], a ring cavity [28], a rectangular cavity [29], a nanodisk cavity [30], and so on. However, most of the current plasmonic waveguide filters are passive, which means the filtering function is fixed upon fabrication and lacks efficient control of plasmonic signal.…”