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...

The demand for today is to have a Compact and reduced size devices, hence requires sized antenna. For sized, array elements can be placed closer each other. However, the problem of mutual coupling, depending on interelement separation their relative orientation, becomes challenge [3][4]. To overcome this, we proposed an EBG structured most used characteristics Electromagnetic Band Gap (EBG) structure are surface wave suppression effect within its band gap. Hence, they reduce coupling due...

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 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...

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...

In this paper, a bandstop filter has been realized by using split ring resonator (SRR) based metamaterial structure. The geometrical dimensions of the SRRs have parametrically optimized in such way that zero transmission (S21 < − 10 dB) occurs over frequency range 3.24 to 4.78 GHz with fractional bandwidth 38.4%. are printed on both sides 1.6 mm thin FR-4 dielectric, making structure ultra-thin nature (∼ λ/46 referred center band). effective permeability retrieved conclude mu-resonance at...

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 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"...

Multi-layer MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> offers numerous advantages over mono-layer in terms of improved absorption, enhanced emission and high optical density states, which make it a better candidate for devices. However, the selective tuning direct-band emissions multi-layer is essential various optoelectronic applications. In this work, we have demonstrated systematic transitions MoS2 using Au coating prepared...

We report a technique named complementary alternating current voltammetry (CACV) to simultaneously measure faradaic and nonfaradaic currents in an electrochemical sensing apparatus using three sequential input potential waveforms: i) triangular waveform as used cyclic (CV); ii) small signal sine modulated waveform; iii) cosine waveform. The output were post-processed obtain the peak I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Fp</sub>...

We present a simple scalable technique for repeatable fabrication of large area (cm2) electromagnetic hot spots using tunable Localized Surface Plasmon Resonance (LSPR) substrates and their k-space microscopic imaging characterization. The were fabricated simply low vacuum air plasma scanning electron microscope gold coater annealing plate. measured permittivity profile optical transmission characteristics such showed changes before after annealing, with clear in the occurrence position LSPR...

Abstract The automobile sector in India is one the key segment of Indian economy as it contributes to 4% India’s GDP and 5% Industrial production. supply chain any firm generally dependent on six driving factors out which three are functional (information, inventory, facilities) 3 logistic (sourcing, pricing, transportation). risk causing chains consists various levels sub-factors under them. Say for instance, risk, can be poor logistics at supplier end, material quality etc., demand...

A compact novel quad-band antenna with dual polarization characteristics is designed and implemented using metamaterial.The proposed matched phase shifted microstrip line fed rotated patch embedded split ring resonator (SRR).The operates at four separate impedance bandwidth of 500 MHz (1.13-1.63GHz), 640 (2.05-2.69GHz), 470 (4.86-5.33GHz) 950 (7.1-8.05GHz).With the use /4 phase-shifted feed, circular realized verified experimental setup.Finally, both linear obtained for each band observed...

Large area triangular gold nanoparticle thin films were fabricated by creating a thermal stress at glass substrate-gold interface. Broadband/Fluorescence Fourier plane imaging of these showed enhanced scattering (confirmed spectra) and good refractive index sensitivity.