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Review on plasmon induced transparency based on metal-dielectric-metal waveguides; ??o?o? MDM ?3￠?ˉ?????-??|??-????èˉ±?ˉ?é??????????????è?°;
摘要： Plasmon induced transparency (PIT) in the transparent window provides new insights into the design of optical filters, switches and storage, and integrated optics. The slow light effect makes PIT applicable to both sensors and slow light devices. Besides, PIT can overcome the diffraction limit of light, which makes it possible to manipulate light on a half-wavelength scale and brings good news to the miniaturization of optical devices. In this paper, we first summarize the researches of PIT phenomenon based on metal-dielectric-metal (MDM) waveguide systems and analyze the physical mechanisms of PIT including bright-dark mode interactions and phase-coupling-induced transparency. Then, we review the applications of PIT in optical sensing, optical filtering, optical switching, slow light devices and optical logic devices. At last, we outline important challenges that need to be addressed, provide corresponding solutions and predict important directions for future research in this area.
关键词： slow-light effect,plasmon induced transparency (PIT),metal-dielectric-metal (MDM) waveguide,optical logic devices
更新于2025-09-23 15:19:57
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Plasmonic Demultiplexer With Tunable Output Power Ratio Based on Metal-Dielectric-Metal Structure and E7 Liquid Crystal Arrays
摘要： A novel tunable plasmonic demultiplexer is proposed and numerically investigated by finite element method(FEM). It consists of two half-nanodisk cavities and two sets of E7 liquid crystal arrays which are side-coupled to three metal-dielectric-metal(MDM) waveguides. The demultiplexer can split the input lights into two parts corresponding to port1(1310nm) and port2(1550nm). The Q-factors of port1 and port2 are 54.6 and 36, and the crosstalk values are -20.7dB and -29.9dB, respectively. Obviously, both channels have high Q-factors and low crosstalk value. Moreover, the E7 liquid crystal arrays play a key role in the whole structure, which makes the output power adjustable proportionally by adjusting the applied voltage. This novel feature greatly enriches the function of our demultiplexer. Using the electronical tunable birefringence characteristic of liquid crystal and its arrays structure paves a new way to realize practical on-chip plasmonic system, which can be widely used not only in demultiplexers but also in nanosensors, optical splitters, filters, optical switches, nonlinear photonic and slow-light devices.
关键词： on-chip plasmonic system,demultiplexer,surface plasmon polaritons(SPPs),Metal-dielectric-metal(MDM) waveguide
更新于2025-09-23 15:19:57
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Plasmonic nanosensor based on multiple independently tunable Fano resonances
摘要： A novel refractive index nanosensor with compound structures is proposed in this paper. It consists of three different kinds of resonators and two stubs which are side-coupled to a metal–dielectric–metal (MDM) waveguide. By utilizing numerical investigation with the finite element method (FEM), the simulation results show that the transmission spectrum of the nanosensor has as many as five sharp Fano resonance peaks. Due to their different resonance mechanisms, each resonance peak can be independently tuned by adjusting the corresponding parameters of the structure. In addition, the sensitivity of the nanosensor is found to be up to 1900 nm/RIU. For practical application, a legitimate combination of various different components, such as T-shaped, ring, and split-ring cavities, has been proposed which dramatically reduces the nanosensor dimensions without sacrificing performance. These design concepts pave the way for the construction of compact on-chip plasmonic structures, which can be widely applied to nanosensors, optical splitters, filters, optical switches, nonlinear photonic and slow-light devices.
关键词： metal–dielectric–metal (MDM) waveguide,nanosensor,on-chip plasmonic structures,Fano resonance,surface plasmon polaritons (SPPs)
更新于2025-09-16 10:30:52