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This study compares the experimental results of absorption and refractive index of a probe laser measured in a strongly driven two-level atom with the results measured in a degenerate two-level system using pump-probe spectroscopy. This work demonstrates the possibility of realization an anomalous dispersive transparent medium using the strongly driven 4s21S0 - 4s4p 1P1 Ca transition. Absorption...
The fluorescence quenching of a single molecule can be controlled using a plasmonic device made of a metallic or negative-index slab and a metallic nanoparticle. The concept of dark near-field fluorescence imaging is introduced.
We report on the optical properties of a metal-organic photonic bandgap structure showing a peak transmission ~44% and that enhances the nonlinear optical properties of bulk Copper by up to an order of magnitude.
Zero-nmacr bandgap has been observed in photonic superlattices consisting of layered stack of materials with positive index of refraction and photonic crystal slab. An experimental verification of FDTD simulations is reported here.
We propose a novel optical switch with slowing light in Bragg reflector waveguide. Slowing light gives us large equivalent refractive index change due to its waveguide dispersion, which permits 90-degree bend of crossbar optical switches.
A new design of a hybrid electro-optic polymer waveguide modulator is demonstrated that uses grayscale lithography to create refractive index tapers by photobleaching. It leads to a device with a half-wave voltage of 1.9 V, modulation efficiency of 15 dB and a fiber to lens insertion loss of 11.6 dB using 20 wt. % AJLS102.
We obtain the complex refractive index of ultra-thin gold film (down to 20 picometers) on thermal oxide on silicon by the combination of in-line (IL) and differential-phase-contrast (DPC) channels of spinning-disc interferometry (SDI).
Refractive index changes induced by pump-signal operation in commercial Yb-doped fibers are shown to be of electronic origin with a strong contribution of UV-transitions to the polarizability difference explored for testing wavelength of 1460-1620 nm.
We have demonstrated nondestructive 3D imaging of the femtosecond laser written 3D structures of both index change and optical breakdown within fused silica by using the optical coherence microscopy providing high lateral and depth resolution.
Artificial magnetism, negative permeability and zero refractive index are demonstrated in 3D-chiral metamaterial that shows giant polarization rotation and circular dichroism.
We present metamaterials that can possess arbitrarily high refractive indices over very broad frequency range. Nearly independent control of permittivity and permeability can be achieved by geometrical designs, without using dispersive, resonant elements.
We report on all-fiber coherent combining of 1.55 mum Er-doped single mode amplifiers achieved by means of active phase control that specifically employs the refractive index changes in Yb-doped fiber induced by 980 nm laser diode.
We demonstrate on-chip absorption spectroscopy using silicon microring resonators with integrated microfluidic channels. Using a 40 mum radius resonator with Q>15,000 we show absorption spectra of less than 90 nL volumes of water and methanol from 1460 nm-1560 nm.
Influence of the effective area spectral dependence on midinfrared supercontinuum generation is demonstrated. The behaviors of photonic crystal and step index fibers is compared. A 700nm width reduction is shown in step index ZBLAN fibers.
A new scheme for optical emission using a high refractive index waveguide and the traveling electron beam in vacuum was demonstrated. Optical emission around wavelength of 1.5 mum was observed for electron acceleration voltage of 40 KV.
Raman spectroscopy has been used to study the femtosecond laser micromachined regions inside silicone-based hydrogel polymers. No significant changes in the Raman spectrum are observed even when index change is as large as +0.06.
Eigenvector analysis on 2D surface plasmon photonic bandgap images is used for refractive index estimation. High precision (rms error of 3.8 times 10-8RIU) and large dynamic range (n = 1.305 to 1.375) are achieved with noisy data.
Time and phase resolved spectroscopy of broadband mid infrared pulses transmitted through the active medium of a mid infrared quantum cascade laser reveal the full complex refractive index and its derivatives over a wide spectral range. Using electro-optic sampling, we can monitor the optical response even above threshold and study effects of gain depletion and decoherence.
Time-domain terahertz spectroscopic studies of the quasi-one-dimensional material PtI(en) reveal a highly anisotropic complex refractive index, including a strongly polarized infrared-active phonon absorption at 2.24 THz corresponding to modulation of the charge-density-wave structure.
The nonlinear refractive index of the monoclinic biaxial nonlinear crystal BiB3O6 was measured at 1064 nm and strong anisotropy was observed with about two times larger value for E//Z-axis in comparison to E//X-axis.
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