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Polarization Controllable Device for Simultaneous Generation of Surface Plasmon Polariton Bessel-Like Beams and Bottle Beams
摘要： Realizing multiple beam shaping functionalities in a single plasmonic device is crucial for photonic integration. Both plasmonic Bessel-like beams and bottle beams have potential applications in nanophotonics, particularly in plasmonic based circuits, near field optical trapping, and micro manipulation. Thus, it is very interesting to find new approaches for simultaneous generation of surface plasmon polariton Bessel-like beams and bottle beams in a single photonic device. Two types of polarization-dependent devices, which consist of arrays of spatially distributed sub-wavelength rectangular slits, are designed. The array of slits are specially arranged to construct an X-shaped or an IXI-shaped array, namely X-shaped device and IXI-shaped devices, respectively. Under illumination of circularly polarized light, plasmonic zero-order and first-order Bessel-like beams can be simultaneously generated on both sides of X-shaped devices. Plasmonic Bessel-like beam and bottle beam can be simultaneously generated on both sides of IXI-shaped devices. By changing the handedness of circularly polarized light, for both X-shaped and IXI-shaped devices, the positions of the generated plasmonic beams on either side of device can be dynamically interchanged.
关键词： polarization-dependent devices,multiple beam shaping functionalities,plasmonic device
更新于2025-09-23 15:21:01
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Ultrafast Plasmonic Optical Switching Structures and Devices
摘要： Plasmonic structures possess rich physics related to the sensitivity of plasmon resonance to the change in the environmental dielectric constant, the enhanced light scattering and optical extinction, and the local field enhancement enabled strong light-matter interactions, which have been applied in refractive-index sensors, optical feedback in various micro- or nano-cavity lasers, surface enhanced Raman scattering spectroscopy, and high-sensitivity molecular detection. However, ultrafast optical response is another important aspect of plasmons, which can be utilized to achieve switching of optical signals in different spectral bands. These optical switching designs are very important for applications in optical logic circuits and optical communication system. In this review, we summarize a series of reports on ultrafast plasmonic optical switches, where we focus our discussions on the structural and device designs, instead of on their physics. By categorizing the designs of optical switches into different groups by their featured performances, we intend to propose the development trend and the commonly interested mechanisms of such ultrafast optical switches. We hope this review will supply helpful concepts and technical approaches for further development and new applications of ultrafast optical switching devices.
关键词： plasmonic device,metal oxides,plasmonic nanostructures,ultrafast optical switching,noble metals,surface plasmon polariton,hybrid plasmons,2D materials
更新于2025-09-12 10:27:22
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Insulator-Metal-Insulator-Metal-Insulator and Metal-Insulator-Metal Vertical Directional Couplers with Surface Plasmon Polariton Waveguides
摘要： We propose two vertical directional couplers (VDCs) based on surface plasmon polariton (SPP) waveguides. One is an SPP insulator-metal-insulator-metal-insulator (IMIMI) VDC. The SPP IMIMI VDC is composed of two 45-(cid:2)m-long S bends, an L (cid:2)m-long straight waveguide, a 4-(cid:2)m-long C gap, and a 500-nm-long M gap. The other is an SPP metal-insulator-metal (MIM) VDC. The SPP MIM VDC is composed of two 10-(cid:2)m-long S bends, an L (cid:2)m-long straight waveguide, a 60-nm-long C gap, and a 500-nm-long M gap. Au is used as the metal and a low-loss polymer is used as the insulator in the IMIMI and MIM waveguides. In the SPP IMIMI VDCs, the excited 5.0 (cid:2)m × 4.5 (cid:2)m input S-s0 mode propagates along the S bend_1, propagates and couples along the straight waveguide L, and propagates again along the S bend_2. The losses due to the L region of the SPP IMIMI VDC are 1.33 dB when L = 13 (cid:2)m and 2.26 dB when L = 23 (cid:2)m and the coupling length is ～10 (cid:2)m In the SPP MIM VDCs, the excited 1.7 (cid:2)m × 0.5 (cid:2)m input G-s0 mode propagates along the S bend_1, propagates and couples along the straight waveguide L, and propagates again along the S bend_2. The losses of L of the SPP MIM VDC are 1.50 dB when L = 5 (cid:2)m and 11.20 dB when L = 65 (cid:2)m and the coupling length is ～65 (cid:2)m. The SPP IMIMI and MIM VDCs can be a potential step in the process of integration from micro-scale to nano-scale.
关键词： Plasmonic Device,Directional Coupler,Plasmonic Based Integrated Circuit,Surface Plasmon Polariton
更新于2025-09-12 10:27:22