This article demonstrates theoretical design of ultracompact all-optical AND, NAND, OR, and NOR gates with two-dimensional nonlinear photonic crystal slabs. Compound Ag-polymer film a low refractive index large third-order nonlinearity is adopted as our material cavities relatively high quality factor about 2000 designed on this polymer slab. Numerical simulations show that logic pump-power in the order tens MW/cm2 can be achieved. These results may provide very useful schemes approaches for...

Here we propose a scheme utilizing the double plasmon modes of gold nanorod (GNR) to efficiently enhance fluorescence surrounding emitters. The transversal and longitudinal surface resonance (TSPR LSPR, respectively) GNR are simultaneously utilized excitation emission efficiency, respectively. To demonstrate idea, GNRs coated with an Oxazine-725 dye molecule-doped silica shell employed. For comparison, nanospheres same also studied, which single mode matches only wavelength Oxazine-725....

Accurate real-time temperature measurement under extreme thermal-pressure conditions remains challenging in aerospace. Sapphire fiber Bragg gratings (FBGs), exhibiting capabilities up to 1900 °C, demonstrate suitability for such environments. However, the development of a high-performance demodulation system capable processing sapphire FBG signals over wide spectral ranges at elevated speeds technical challenge. This study presents signal that incorporates an all-dielectric subwavelength...

In recent years all-optical switching and logic devices have received extensive attention due to their potential applications in next generation ultrahigh-speed information processing optical computing. Kerr nonlinear photonic crystals (NPC) offer a promising route realize with ultrafast response time low pump power based on simple robust physical mechanisms. this feature article, we present our investigation NPCs made from polystyrene, an organic polymer material large nonlinearity...

Surface plasmon resonance (SPR) owing to its extreme sensitivity the refractive index of surrounding medium has been widely applied chemical and biological sensing. However, it is difficult realize SPR sensing simultaneously with large figure merit (FOM) in a conventional prism coupling structure. In this paper, we numerically study SPRs polymer-protected sodium thin film sinusoidal nanograting based on Kretschmann configuration using finite element method (FEM). near-infrared wavelengths,...

We present a versatile technique based on nano-imprint lithography to fabricate high-quality semiconductor-polymer compound nonlinear photonic crystal (NPC) slabs. The approach allows one infiltrate uniformly polystyrene materials that possess large Kerr nonlinearity and ultrafast response into the cylindrical air holes with diameter of hundred nanometers are perforated in silicon membranes. Both structural characterization via cross-sectional scanning electron microscopy images optical...

On the basis of single metal-insulator-metal (MIM) ring resonator (RR) structure, which acts as a band-stopped filter, dual RR (DRR) system is proposed to obtain plasmon-induced transparency (PIT) effect. By rotating second an angle, double PIT windows are achieved due interference effects, attributed different excitation pathways from first RR. In addition, triple peaks also by adding extra inclined DRR system. Phase shifts, will occur at each window, and analyzed. These compact MIM...

Through adding a groove to an end-coupled perfect ring (PR) resonator, ring-groove (RG) joint metal-insulator-metal (MIM) structure is proposed. Destructive interference for the expected surface plasmon mode will occur due phase differences between two optical paths, leading plasmonic-induced absorption response with abnormal dispersion, which analogous electromagnetically induced in three-level atomic system. A transmission dip achieved at former-peak wavelength of PR while peaks arise...

Plasmonic resonances are attractive and promising for biosensing applications benefiting from their strong nanoscale light confinement sensitivity to the refractive index of surrounding medium. Here, we numerically theoretically investigate a metal–insulator-metal (MIM) nanograting structure, where gold nanostrip arrays placed on thin dielectric layer with sodium film underlay. The structure is obliquely excited by transverse magnetic (TM) wave prism supporting whole MIM structure. We found...

We design a Kerr-effect sensitive microcavity in hybrid semiconductor nonlinear photonic crystal (PhC) slabs for application all-optical switching. Our new concept cavity is made from infiltrating the air hole array and coating surface of usual PhC with polystyrene, let polystyrene instead occupy center cavity. Optimization by modulating structure parameter yields quality factor Q=1600 shift magnitude δf≈8.4 nm while pumping light intensity 80 GW/cm2. This configuration can help to realize...

The dependence of the transmission behavior magnetic fluids on incident power density a laser beam is investigated and conventional Z-scan technique employed to continuously vary optical forces induced by beam. We calculate exerted nanoparticles compare them with those for gold silica nanoparticles. It found that are comparable In addition, calculation results show absorption force dominant at low densities while gradient scattering become significant high when clustering occurs....

Fano resonances usually arise when a narrow resonance or discrete state and broad continuum are coupled. In this paper, we theoretically numerically study asymmetric line shape realized in photonic crystal nanobeam (PCN) side-coupled with cavity (PCNC). Asymmetric transmission profiles peak valley obtained for low index concentrated mode. The valley, associated the destructive interference, of our PCN-PCNC structures is deeper than that waveguide Fabry-Perot resonator PCNC structure. Through...

High-performance all-optical switching is of paramount importance to realize integrated photonic circuit. Due the ultra-sharp resonance mode, it demonstrated that Fano far superior Lorentz for implementation switching. However, still a difficulty an integratable with faster response and lower energy simultaneously. In this work, we propose double resonances based composed silicon-polymer compound crystal nanobeam (PCN) side-coupled cavity (PCNC). The pump probe wavelengths locate at position...

As application scenarios grow in complexity, multifunctional integrated metasurfaces have been proposed as a potential development direction. We propose high Q-factor metasurface-based platform composed by size-scaled metasurface polarization selective absorbers (MPSAs) capable of absorption, refractive index sensing and chiral response. By designing gold step-shaped unit structure that can break the in-plane out-of-plane symmetry, bound states continuums (BICs) with response surface lattice...

The achievement of ultrafast all-optical switching on chip is a fundamental issue integration. A feasible and promising method for this to combine semiconductor photonic crystals with highly nonlinear polymer materials form the hybrid crystal. In paper we numerically investigate femtosecond dynamic response based effect band gap edge shift in one-dimensional (1D) semiconductor–polymer crystal (NPC) structures. Taking into account Kerr relaxation time simultaneously, introduction can realize...

We demonstrated the creation of large volume three-dimensional optical matter by optically trapping polystyrene spheres in a capillary and resulting switching operation. The formation was confirmed examining diffraction pattern trap region. Optical with an extinction ratio as ∼20dB realized. From dynamics matter, it found that transition from disordered state to ordered one appeared be quite fast while recovery system took much longer time.

We study the control of Fano resonances in a 2D photonic crystal nanobeam (PCN) side-coupled with cavity (PCNC) by choosing different modes, position bandgap PCNs and displacement between PCNCs. By increasing refractive index holes surrounding medium, it is found that air mode even mirror-reflection symmetry holds highest sensitivity (538 nm/RIU; RIU, unit) maximal figure merit (FOM = 516). Our results can be extended to practical 3D configuration, where an air-suspended silicon PCN PCNC....

We investigate the dependence of differential reflection on structure parameters quantum dot (QD) heterostructures in pump-probe measurements by both numerical simulations based finite-difference time-domain technique and theoretical calculations theory dielectric films. It is revealed that value sign strongly depend thickness cap layer QD layer. In addition, a comparison between carrier dynamics undoped p-doped InAs∕GaAs QDs carried out measurements. The capture time from GaAs barrier into...