<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A proof-of-concept imaging technique that combines the advantages of wide-field surface plasmon, leakage radiation, and total internal reflection fluorescence microscopy methods is presented. High-contrast non-scanning images with subwavelength resolution patterned homogeneous samples coated a fluorescent material were demonstrated. We show image formed in back focal plane objective lens can be...

Light propagation in dielectric plasmonic crystals with different parameters and symmetries was investigated by plasmon tomography. We show that the photonic Fermi surfaces at crystal’s reciprocal lattice space can be observed directly from Fourier plane images. Directional gaps were where isofrequency wavevectors of propagating surface mode intersect first Brillouin zone crystal structures. determined angular magnitude directional depends strongly on symmetry period.

We design and experimentally demonstrate a simple, single-shot method for the generation of arbitrary composite vortex (CV) beams using hybrid binary fork gratings (hBFG). These were computationally generated by removing central region around fork-dislocation azimuthal charge ℓ1 substituting it with BFG different ℓ2. The geometrical parameters hBFGs optimized efficient CV beams. was further extended to consisting three ℓ higher radial charges p. This simple may be useful generate complex...

We report results on the propagation modes in plasmonic structures incorporating a gain medium using Fourier-plane leakage radiation microscopy. demonstrate that high contrast images and detailed mode information can be obtained with arrays of dielectric loaded surface plasmon waveguides. Clear interference effects were observed corresponding to bimetallic stripes coated material. This indicates coherent superposition leaked fluorescence from coupled adjacent waveguides as result stimulated emission.

We demonstrated room temperature near infrared (NIR) region random lasing (RL) (800-950 nm), with a threshold of nearly 500 μW, in ∼200 nm thick MoS2/Au nanoparticles (NPs)/ZnO heterostructures using photoluminescence spectroscopy. The RL the above system arises mainly due to following three reasons: (1) enhanced multiple scattering because Au/ZnO disordered structure, (2) exciton-plasmon coupling Au NPs, and (3) charge transfer from ZnO MoS2 flakes. has recently attracted tremendous...

In the present work, we report plasmon induced brightening of dark excitons (XD) in Au nanoparticle (Au-NP) coated monolayer (1L) WSe2. We observed one order enhancement photoluminescence (PL) intensity and surface enhanced Raman scattering Au-NP/1L-WSe2 at room temperature (RT). Temperature dependent PL measurements showed emission from RT down to 100 K contrast reduced which is generally for pristine 1L-WSe2. attribute this effect out-of-plane electric field by Au-NPs, results dipole...

We describe a dynamic direct space-to-time pulse shaper based on the combination of reflective arrayed waveguide grating multiplexer and an array digital micromirrors used as external reflector. Spatial modulation was obtained by imposing reconfigurable periodic structure micromirror array. The period this number reflecting within each varied to produce sequences with variable repetition rates burst different pulsewidths. Experimental results are in excellent agreement simulated temporal...

Light propagation in dielectric loaded surface plasmon polariton waveguide (DLSPPW) resonant coupling devices operating at visible frequencies was experimentally investigated. The transmission characteristics of these were studied by leakage radiation microscopy. We show that a strong between DLSPPWs can be achieved with nanoscale gaps. demonstrate the operation compact DLSPPW linear couplers and 3 dB power splitters. performances micro-DLSPPW racetrack resonators signal drop filter are also...

We experimentally demonstrate and image the hybrid nature of surface plasmon polaritons (SPPs) at visible wavelengths excited in low aspect ratio 1D 2D periodic plasmonic structures with periods nearly equal to resonance wavelengths, fabricated on thin homogeneous metal-coated glass substrates. A metal layer was sandwiched between substrate patterns out-couple SPPs as leakage radiation through substrate. This resulted detection SPP excitation transmission peaks a dark background, opposed...

We report on the direct current (dc) current-voltage ($I$-$V$) characteristics of few-layer muscovite mica (MuM) flakes exfoliated and transferred onto $\mathrm{Si}\mathrm{O}$${}_{2}$/$\mathrm{Si}$ substrate, under different substrate dc bias voltages. Contrary to usual observations in conventional two-dimensional systems, we observe an increase in-plane electrical conductivity with a reducing thickness MuM flakes. At given voltage, approximately five-layered flake (${T}_{3}$) is 3 orders...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> We report simulations and experimental results on the incidence-angle dependence of optical reflectivity asymmetric dielectric–metal–dielectric planar structures. Transfer-matrix method 2-D finite-element analysis revealed presence multiple resonances that were attributed to surface plasmon (SP) polariton mode at metal–dielectric interfaces guided-wave modes within waveguide. The number scale...

We present simulation results on the propagation characteristics of active plasmonic waveguides at 1.55 mum wavelength based semiconductors as gain media. Three waveguide structures were investigated: metal rib, metal-semiconductor-metal (MSM), and triangular groove. In all three structures, we observed strong plasmon mode confinement with nanoscale spot-sizes corresponding simulated values compatible existing semiconductor technology. show effect systematic modification geometry required...

We present a reconfigurable optical filter with multiple passband channels based on the combination of diffraction grating and an array digital micromirrors. The allows for adjustment central frequency its individual to match standard wavelength grids precision better than 0.033 nm. number channels, channel width, peak profile can be dynamically reconfigured by changing periodic pattern imposed micromirror array. Experimental results are in excellent agreement basic design relations...

We describe the use of a plasmonic version quantum eraser for imaging applications. Two perpendicular surface plasmon polariton (SPP) beams were excited in glass-metal sample using leakage radiation microscope. The polarization state SPP-coupled leaked to substrate permits identify path photons along metal-air interface sample. Introduction linear polarizer after microscope high numerical aperture lens erases which-path information. This enabled us image on charge coupled device camera...

We demonstrate an optical technique for refractive index and thickness sensing of sub-wavelength-thick dielectric analytes. The utilizes the broadband, multimode, directional leakage radiation arising from excitation hybrid mode surface plasmons (SP) on low aspect ratio periodic plasmonic substrates with period ≈λ. approach requires relaxed fabrication tolerances compared to extra ordinary transmission-based techniques, wherein minor shifts in fabricated dimensions result a very large change...

In the present work, we report different interlayer excitonic states of an aligned $\mathrm{Mo}{\mathrm{Se}}_{2}/\mathrm{Mo}{\mathrm{S}}_{2}$ incommensurate van der Waals (vdW) heterostructure (HS). The HS was fabricated by stacking chemical vapor deposited monolayers, and it studied using photoluminescence (PL) measurements. We observed emergence two low-energy peaks in PL spectrum measured at 100 K, which were absent constituent monolayers. orbital resolved electronic band structure...

We demonstrate for what we believe to be the first time generation of sequences ultrafast optical pulses by phase modulation in a direct space-to-time pulse shaper. The shaper is based on combination reflective arrayed waveguide grating multiplexer and an external reflector. spatial was obtained fabricating corrugated patterns that with different repetition rates can changing period patterned mask.

In this work, we demonstrated an on-chip label-free imaging microscopy using real and Fourier Plane (FP) dark field images of surface plasmons, by integrating engineered plasmonic substrates with different shapes microfluidic channels. After successful integration fabricated nanostructures SU-8 based channels, index monitoring analytes refractive indices was resolution 1.63 × 10−4 RIU achieved quantifying CMYK components captured images. Label-free for interface colorless miscible immiscible...

Abstract We report on multiple excitonic resonances in bilayer tungsten diselenide (BL-WSe 2 ) stacked at different angles and demonstrate the use of stacking angle to control occurrence these excitations. BL-WSe with were fabricated by chemical vapour deposited monolayers analysed using photoluminescence measurements temperature range 300–100 K. At reduced temperatures, several features observed occurrences exitonic found be dependent. Our results indicate that controlling angle, it is...

We imaged polarization rotation of transmitted light in 1D Periodic Plasmonic Structures (PPS) fabricated on thin metal coated dielectric substrate. Several PPS 50% duty cycle and extremely low aspect ratio (height to width ratio) 0.1 were designed using rigorous coupled wave analysis exhibit transmission plasmonic resonances at optical wavelengths (400 nm 700 nm). electron beam lithography, evaporation lift-off process glass substrates with metal. The characterized normally incident...

We experimentally demonstrate a simple method for the generation of composite vortex beams using resonant ultra-thin dielectric fork gratings (UFGs) thicknesses an order magnitude less than incident wavelength. The degradation in diffraction efficiency these at reduced was computationally shown to be compensated by introducing thin continuous gold layer (Au, 30 nm) between grating and substrate. At resonance wavelength, UFGs with Au <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...