Controlling light-with-light without nonlinearity
... patterning, one can manipulate the balance among absorption, transmission and reflection in sub-wavelength plasmonic films to achieve desired levels at any visible/infrared wavelength. Figure 3c shows modulation of total output intensity resulting from modulation of control intensity in the time dom ...
... patterning, one can manipulate the balance among absorption, transmission and reflection in sub-wavelength plasmonic films to achieve desired levels at any visible/infrared wavelength. Figure 3c shows modulation of total output intensity resulting from modulation of control intensity in the time dom ...
document
... A photodiode converts photons that hit its surface into a current. We place a photodiode such that the light from the atoms hit it, and measure the electric current. Using this value, we can calculate the steady-state atom number in the trap as well as the loading time. We found that 5.6 million ato ...
... A photodiode converts photons that hit its surface into a current. We place a photodiode such that the light from the atoms hit it, and measure the electric current. Using this value, we can calculate the steady-state atom number in the trap as well as the loading time. We found that 5.6 million ato ...
Multiband perfect absorbers using metal
... group velocity decreases more rapidly with the higher-n materials [20]. It should be pointed out that such a dramatic reduction of the group velocity appeared here and for example in [10] can lead to the angle-insensitive absorption. In these regards, the higher-order modes exhibit more omnidirectio ...
... group velocity decreases more rapidly with the higher-n materials [20]. It should be pointed out that such a dramatic reduction of the group velocity appeared here and for example in [10] can lead to the angle-insensitive absorption. In these regards, the higher-order modes exhibit more omnidirectio ...
Soft X-ray spectroscopy of single sized CdS nanocrystals: size
... confining potentials (IP-EMA) [19] which predicts the CBM shift to dominate the band gap opening. In contrast, the experimental results show that both, VBM and CBM shifts, contribute about equally to the gap opening. Using an EMA algorithm developed to account for finite potential heights (FP-EMA) i ...
... confining potentials (IP-EMA) [19] which predicts the CBM shift to dominate the band gap opening. In contrast, the experimental results show that both, VBM and CBM shifts, contribute about equally to the gap opening. Using an EMA algorithm developed to account for finite potential heights (FP-EMA) i ...
Gas Chromatography
... GC is currently one of the most popular methods for separating and analyzing compounds. This is due to its high resolution, low limits of detection, speed, accuracy and reproducibility. GC can be applied to the separation of any compound that is either naturally volatile (i.e., readily goes into the ...
... GC is currently one of the most popular methods for separating and analyzing compounds. This is due to its high resolution, low limits of detection, speed, accuracy and reproducibility. GC can be applied to the separation of any compound that is either naturally volatile (i.e., readily goes into the ...
~ ) Pergamon
... second aperture of a fixed diameter, 10 mm, is mounted on the interior wall of the chamber. The first aperture prevents the strong direct thermal emission of the sample and the graphite stage from entering the analyzer unit and the second reduces the amount of reflected stray light entering the anal ...
... second aperture of a fixed diameter, 10 mm, is mounted on the interior wall of the chamber. The first aperture prevents the strong direct thermal emission of the sample and the graphite stage from entering the analyzer unit and the second reduces the amount of reflected stray light entering the anal ...
Blue light hazard
... exposure to ultraviolet (UV) radiation. Wavelengths shorter than 320 nm are most effective in causing this condition. The peak of the action spectrum is approximately at 270 nm. Note: Different action spectra have been published for photokeratitis and photoconjuctivitis (CIE 106/2 and CIE 106/3– 199 ...
... exposure to ultraviolet (UV) radiation. Wavelengths shorter than 320 nm are most effective in causing this condition. The peak of the action spectrum is approximately at 270 nm. Note: Different action spectra have been published for photokeratitis and photoconjuctivitis (CIE 106/2 and CIE 106/3– 199 ...
Superluminal and Slow Light Propagation in a Room
... Fig. 1. The crystal structure of alexandrite looking along the c axis (25). The arrows indicate the locations of ion sites that have mirror or inversion symmetry. On the right, the corresponding energy-level diagrams for Cr3⫹ ions at the different sites are shown. Mirror-site ions experience excited ...
... Fig. 1. The crystal structure of alexandrite looking along the c axis (25). The arrows indicate the locations of ion sites that have mirror or inversion symmetry. On the right, the corresponding energy-level diagrams for Cr3⫹ ions at the different sites are shown. Mirror-site ions experience excited ...
Strong critical coupling and polaritonic coherent perfect
... In all the aforementioned examples, the material loss mechanisms (resistive, impurity scattering, interband electronic transitions…) feature a much larger bandwidth than the energy exchange rate with the electromagnetic field. Therefore, independently of the presence of a resonator and its radiative ...
... In all the aforementioned examples, the material loss mechanisms (resistive, impurity scattering, interband electronic transitions…) feature a much larger bandwidth than the energy exchange rate with the electromagnetic field. Therefore, independently of the presence of a resonator and its radiative ...
Applied Physics Letters
... Unfortunately, electronic localization in organic semiconductors yields structured optical absorption spectra with pronounced regions of weak absorption. This limits efficiency because the short exciton diffusion length within organic semiconductors demands uniformly strong absorption.2 In this work ...
... Unfortunately, electronic localization in organic semiconductors yields structured optical absorption spectra with pronounced regions of weak absorption. This limits efficiency because the short exciton diffusion length within organic semiconductors demands uniformly strong absorption.2 In this work ...
(FT-IR) Microspectroscopic Measurements of Intact Spheres
... such that the recovered spectra are independent of the sample morphology.4,6–8 One set of approaches today seeks to model the material as an idealized object, such as a sphere, and largely neglects the optical configuration of the microscope and spectrometer. Success has been reported in using this ...
... such that the recovered spectra are independent of the sample morphology.4,6–8 One set of approaches today seeks to model the material as an idealized object, such as a sphere, and largely neglects the optical configuration of the microscope and spectrometer. Success has been reported in using this ...
Using the Spectrophotometer
... incident light transmitted through a solution. In other words it they are used to measure the amount of light that passes through a sample material, and by comparison to the initial intensity of light they indirectly measure the amount of light absorbed by a sample. They are also designed to transmi ...
... incident light transmitted through a solution. In other words it they are used to measure the amount of light that passes through a sample material, and by comparison to the initial intensity of light they indirectly measure the amount of light absorbed by a sample. They are also designed to transmi ...
Optical gain in silicon nanocrystals
... The most direct evidence of light ampli®cation from our systems was provided by pump and probe transmission measurements. An intense laser beam (pump) at 390 nm excites the sample in order to reach the population inversion needed for ampli®cation, while a weak probe signal at ,800 nm passes through ...
... The most direct evidence of light ampli®cation from our systems was provided by pump and probe transmission measurements. An intense laser beam (pump) at 390 nm excites the sample in order to reach the population inversion needed for ampli®cation, while a weak probe signal at ,800 nm passes through ...
A negative permeability material at red light
... thickness δ are chosen to reproduce the complex values of far-field reflectance and transmittance due to a given film. Optical negative index metamaterials (NIMs), also known as left-handed materials, are artificially engineered metal-dielectric composites that exhibit n' < 0 within a certain range ...
... thickness δ are chosen to reproduce the complex values of far-field reflectance and transmittance due to a given film. Optical negative index metamaterials (NIMs), also known as left-handed materials, are artificially engineered metal-dielectric composites that exhibit n' < 0 within a certain range ...
Chapter 5. IR Spectroscopy and Raman Scattering
... The possible vibrations of a molecule are sensitive to IR absorption if the vibration results in a change in the dipole moment, u, of the molecule. The dipole moment is the product of the charge times distance and is similar to the moment of inertia in mechanics except that charge is the weighting f ...
... The possible vibrations of a molecule are sensitive to IR absorption if the vibration results in a change in the dipole moment, u, of the molecule. The dipole moment is the product of the charge times distance and is similar to the moment of inertia in mechanics except that charge is the weighting f ...
................................................................. Wave–particle duality of C molecules
... and He clusters, where the apparently narrower slit was interpreted as being due to the influence of the van der Waals interaction with the SiNx grating during the passage of the molecules15. This effect is expected to be even more pronounced for C60 molecules owing to their larger polarizability. T ...
... and He clusters, where the apparently narrower slit was interpreted as being due to the influence of the van der Waals interaction with the SiNx grating during the passage of the molecules15. This effect is expected to be even more pronounced for C60 molecules owing to their larger polarizability. T ...
CHAPTER 3
... attenuation is from transition of metal impurity ions such as iron, chromium, cobalt, and copper 2- Intrinsic absorption- Intrinsic absorption results from electronic absorption bands in UV region and from atomic vibration bands in the near infrared region. Absorption occurs when a photon interacts ...
... attenuation is from transition of metal impurity ions such as iron, chromium, cobalt, and copper 2- Intrinsic absorption- Intrinsic absorption results from electronic absorption bands in UV region and from atomic vibration bands in the near infrared region. Absorption occurs when a photon interacts ...
optical design of an echelle grating based atomic emission
... system based on atomic emission spectroscopy (AES). The spectrometer records the intensities of various spectral lines in the emission spectrum, which is then used for the determination of the concentration of different elements simultaneously. Traditionally a Rowland circle mounted concave grating ...
... system based on atomic emission spectroscopy (AES). The spectrometer records the intensities of various spectral lines in the emission spectrum, which is then used for the determination of the concentration of different elements simultaneously. Traditionally a Rowland circle mounted concave grating ...
Color center production by femtosecond-pulse laser
... 2.04 TW/cm2. In both cases, this is a first-approximation effect, because nonlinear effects were not considered. To explain the color center production by the ultrashort pulses, we propose a mechanism based on the electron avalanche that develops due to a strong initial nonlinear multiphoton absorpt ...
... 2.04 TW/cm2. In both cases, this is a first-approximation effect, because nonlinear effects were not considered. To explain the color center production by the ultrashort pulses, we propose a mechanism based on the electron avalanche that develops due to a strong initial nonlinear multiphoton absorpt ...
FTIR absorption study of hydroxyl ions in KHo(WO4)2 - DT
... The presence of OH– bands can be justified by the isotopic exchange process. High temperature treatments in heavy water vapour atmosphere generally result in the appearance of OD– bands in the crystals. Our KHo(WO4)2 crystal was heated to 873 K for one hour in air bubbled through D2O and then the ab ...
... The presence of OH– bands can be justified by the isotopic exchange process. High temperature treatments in heavy water vapour atmosphere generally result in the appearance of OD– bands in the crystals. Our KHo(WO4)2 crystal was heated to 873 K for one hour in air bubbled through D2O and then the ab ...
VI. ELECTRONIC SPECTROSCOPY The visible (V) and ultraviolet
... 1801 (Thomas Young): discovery of optical interference (“Whenever two portions of the same light arrive to the eye by different routes, either exactly or very nearly in the same direction, the light becomes most intense when the difference of the two routes is any multiple of a certain length, and l ...
... 1801 (Thomas Young): discovery of optical interference (“Whenever two portions of the same light arrive to the eye by different routes, either exactly or very nearly in the same direction, the light becomes most intense when the difference of the two routes is any multiple of a certain length, and l ...
Fourier transform infrared spectroscopy of aqueous solutions using
... to the detection of small signals and may be filtered out. Even so, this approach is not always sufficient and the limitations of the single-beam measurement still pertain. Dual-beam spectroscopy is an elegant solution to the above mentioned problems. The technique provides simultaneous measurement ...
... to the detection of small signals and may be filtered out. Even so, this approach is not always sufficient and the limitations of the single-beam measurement still pertain. Dual-beam spectroscopy is an elegant solution to the above mentioned problems. The technique provides simultaneous measurement ...
Analysis of selected gaseous organic micro
... in air by means of solid phase microextraction-gas chromatography-mass spectrometry. Calibration problems J. Namiesnik, D. Gorlo, L. Wolska and B. Zygmunt Department of Analytical Chemistry, Chemical Faculty Technical University of Gdañsk (TUG), 80-956 Gdañsk, Poland Abstract. In this work, problems ...
... in air by means of solid phase microextraction-gas chromatography-mass spectrometry. Calibration problems J. Namiesnik, D. Gorlo, L. Wolska and B. Zygmunt Department of Analytical Chemistry, Chemical Faculty Technical University of Gdañsk (TUG), 80-956 Gdañsk, Poland Abstract. In this work, problems ...
Synthesis and Optical Spectroscopy of Cadmium Chalcognide
... Synthesis and Optical Spectroscopy of Cadmium Chalcogenide Semiconductor Nanocrystals K. Lee, S.M. Ma, L. Creekmore, R. Battle, Q. Yang, J.T. Seo (Advisor) and B. Tabibi Department of Physics, Hampton University, Hampton, VA 23668, USA High optical quality Cd chalcogenide (Te, Se, and S) quantum dot ...
... Synthesis and Optical Spectroscopy of Cadmium Chalcogenide Semiconductor Nanocrystals K. Lee, S.M. Ma, L. Creekmore, R. Battle, Q. Yang, J.T. Seo (Advisor) and B. Tabibi Department of Physics, Hampton University, Hampton, VA 23668, USA High optical quality Cd chalcogenide (Te, Se, and S) quantum dot ...
Atomic absorption spectroscopy
Atomic absorption spectroscopy (AAS) is a spectroanalytical procedure for the quantitative determination of chemical elements using the absorption of optical radiation (light) by free atoms in the gaseous state.In analytical chemistry the technique is used for determining the concentration of a particular element (the analyte) in a sample to be analyzed. AAS can be used to determine over 70 different elements in solution or directly in solid samples used in pharmacology, biophysics and toxicology research.Atomic absorption spectroscopy was first used as an analytical technique, and the underlying principles were established in the second half of the 19th century by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff, both professors at the University of Heidelberg, Germany.The modern form of AAS was largely developed during the 1950s by a team of Australian chemists. They were led by Sir Alan Walsh at the Commonwealth Scientific and Industrial Research Organisation (CSIRO), Division of Chemical Physics, in Melbourne, Australia.Atomic absorption spectrometry has many uses in different areas of chemistry such as: Clinical analysis: Analyzing metals in biological fluids and tissues such as whole blood, plasma, urine, saliva, brain tissue, liver, muscle tissue, semen Pharmaceuticals: In some pharmaceutical manufacturing processes, minute quantities of a catalyst that remain in the final drug product Water analysis: Analyzing water for its metal content.↑ ↑ ↑