A5080544402- Plasmonic and Surface Plasmon Research
- Orbital Angular Momentum in Optics
- Photonic and Optical Devices
- Metamaterials and Metasurfaces Applications
- Advanced Fiber Laser Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Nonlinear Photonic Systems
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Optical Coatings and Gratings
- Thermal Radiation and Cooling Technologies
- Near-Field Optical Microscopy
- Optical Wireless Communication Technologies
- Carbon Nanotubes in Composites
- Mechanical and Optical Resonators
- Laser-Matter Interactions and Applications
- Transition Metal Oxide Nanomaterials
Northwestern Polytechnical University
2015-2019
We present a kind of harmonic mode locking bound-state solitons in fiber laser based on molybdenum disulfide (MoS(2)) saturable absorber (SA). The locker is fabricated by depositing MoS(2) nanosheets D-shaped (DF). In the laser, two form pulses with temporal separation 3.4 ps, and are equally distributed at repetition rate 125 MHz, corresponding to 14th harmonics fundamental cavity (8.968 MHz). Single- multiple-pulses emissions also observed changing pump power optimizing DF SA. Our...
We propose a strategy for active control of second harmonic generation (SHG) in plasmonic Fano structure by electrically doping its underlying monolayer graphene. A detailed theoretical model the proposed scheme is developed and numerical simulations are carried out to demonstrate operation. Specifically, we show that merely 30 meV change graphene Fermi level can result 45 times increase SHG peak intensity, accompanied resonance wavelength shift spanning 220 nm. Further analysis uncovers...
We report a method to tune the second harmonic generation (SHG) frequency of metallic octamer by employing cylindrical vector beams as excitation. Our exploits ability spatially match polarization state excitations with fundamental target plasmonic modes, enabling flexible control SHG resonant frequency. It is found that enhanced over broad band (400 nm) changing excitation from linearly polarized Gaussian beam radially and azimuthally beams. More strikingly, when subjected an beam,...
We demonstrate that a highly localized plasmonic dark mode with radial symmetry, termed quadrupole-bonded breathing mode, can be used for optically trapping the dielectric nanoparticles. In particular, annular potential well produced by this shows sufficiently large depth to stably trap 5 nm particles under relatively low optical power. Our results address quest precisely sub-10 high yield and pave way placing conforming specific geometric pattern.
We propose a scheme to extend the measuring range of transverse displacement sensor by exploiting interaction an azimuthally polarized beam (APB) with single metal-dielectric core-shell nanoparticle. The focused APB illumination induces longitudinal magnetic dipole (MD) in nanoparticle, which interferes induced electric (ED) bring forth unidirectional scattering at specific position within focal plane. Emphatically, rapidly varying electromagnetic field plane leads remarkable sensitivity...
Being an enabling technology for applications such as ultrasensitive biosensing and surface enhanced spectroscopy, enormous research interests have been focused on further boosting the local field enhancement at Fano resonance. Here, we demonstrate a plasmonic resonance resulting from interference between narrow magnetic dipole mode broad electric in split-ring resonator (SRR) coupled to nanoarc structure. Strikingly, when subjected azimuthally polarized beam (APB) excitation, intensity...
We experimentally demonstrate a scheme to deterministically excite three-dimensionally oriented electric dipole in single Au nanosphere by using tightly focused radially polarized beam whose focal field possesses polarization states along three-dimensional (3D) orientations owing the spatial overlap between longitudinal and radial components. Experiment observations indicate that orientation of an excited moment gradually changes from out-of-plane in-plane when is moved away center, which...
We report on the existence of optical Bloch oscillations (OBOs) and Zener tunneling (ZT) Airy beams in ionic-type photonic lattices with a refractive index ramp. Different from their counterparts uniform lattices, undergoing OBOs show an alternatively switched concave convex trajectory as well periodical revival input beam profiles. Moreover, lattice established photorefractive crystal exhibits reconfigurable structure, which provides flexible way to tune amplitude period OBOs. Remarkably,...
We show that an azimuthally polarized beam (APB) excitation of a plasmonic Fano structure made by coupling split-ring resonator (SRR) to nanoarc can enhance second harmonic generation (SHG). Strikingly, almost 30 times enhancement in SHG peak intensity be achieved when the is switched from linearly (LPB) APB. attribute this significant corresponding increase local field at fundamental frequency SHG, resulting improved conversion efficiency between APB and modes structure. also unlike LPB,...
We demonstrate a scheme to characterize the localized surface plasmon resonances (LSPRs) of an individual metallic nanorod by employing focused radially polarized beam (RPB) illumination under normal incidence. The RPB has unique three-dimensional electric field polarization distribution in focal plane, which can effectively and selectively excite dipole multipole just moving within plane. This performance be attributed mode matching between excitation incident LSPRs nanorod. Emphatically,...
We propose and demonstrate an approach for tailoring the Raman response of individual single-walled carbon nanotube (SWNT) by employing optical vortex as excitation. Specifically, we observe blueshifts radial breathing mode G when topological charge beam is increased from 0 to 5. Further theoretical analysis yields that absorption corresponding laser heating effect SWNT are inversely proportional vortex. Such a decrease in weakens softening C-C bonds, leading modes.
Metallic hexamer, very much the plasmonic analog of benzene molecule, provides an ideal platform to mimic modes coupling and hybridization in molecular systems. To demonstrate this, we present a detailed study on radial breathing mode (RBM) dual-hexamers. We excite RBMs hexamers by symmetrically matching polarization state illumination with distribution electric dipole moments dual-hexamer. It is found that RBM exhibits nonexponential decay when inter-hexamer separation increased, owing dark...
Boosting the nonlinear conversion rate in nanoscale is pivotal for practical applications such as highly sensitive biosensors, extreme ultra-violate light sources, and frequency combs. Here, we theoretically study enhancement of second-harmonic generation (SHG) a plasmonic trimer assisted by breathing modes. The geometry fine-tuned to produce strong resonances at both fundamental SH wavelengths boost SHG intensity. Moreover, it found that modes show remarkable ability augment increasing...