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Raman Spectroscopy
... The typical procedure for taking a spectrum is as follows: 1. The sample to be measured is placed in a glass bottle and a Raman spectrum of the glass+sample is taken. 2. A Raman spectrum of just the glass bottle is taken as a “dark” spectrum. 3. The effective Raman spectrum is the spectrum of sample ...
... The typical procedure for taking a spectrum is as follows: 1. The sample to be measured is placed in a glass bottle and a Raman spectrum of the glass+sample is taken. 2. A Raman spectrum of just the glass bottle is taken as a “dark” spectrum. 3. The effective Raman spectrum is the spectrum of sample ...
High optical absorption in graphene
... films may under favorable conditions (that is for high damping materials with nearly imaginary dielectric constant) be approached by tuning of the film thickness alone, as demonstrated by Driessen et al. [6,7]. However a more widely applicable approach to realize these optimal conditions is to explo ...
... films may under favorable conditions (that is for high damping materials with nearly imaginary dielectric constant) be approached by tuning of the film thickness alone, as demonstrated by Driessen et al. [6,7]. However a more widely applicable approach to realize these optimal conditions is to explo ...
INTERFEROMETERS NOTE: Most mirrors in the apparatus are front
... surfaces nor wipe them. they can be easily permanently damaged. ...
... surfaces nor wipe them. they can be easily permanently damaged. ...
Rotational Raman Spectra of Diatomic Molecules
... to wavenumber, expressed in terms of energy shift from the “central” laser (Rayleigh scattering) line. Not too difficult, as follows: 1. We can convert all of the data to wavenumbers, just by taking 1/ with expressed in cm So take the Å data and multiple by (102 cm)/(1010 Å), and then invert. ...
... to wavenumber, expressed in terms of energy shift from the “central” laser (Rayleigh scattering) line. Not too difficult, as follows: 1. We can convert all of the data to wavenumbers, just by taking 1/ with expressed in cm So take the Å data and multiple by (102 cm)/(1010 Å), and then invert. ...
Διαφάνεια 1
... 1st forbidden frequency domain: ω/c = kz/neq where neq: equivalent index of silica + holes and it is λ dependant Grey area corresponds to the classical guiding in fibers by TIR for which as long as k z/neq ≥ ω/c (=kfree space) the wave propagating in the core is confined there (no refraction) 2nd fo ...
... 1st forbidden frequency domain: ω/c = kz/neq where neq: equivalent index of silica + holes and it is λ dependant Grey area corresponds to the classical guiding in fibers by TIR for which as long as k z/neq ≥ ω/c (=kfree space) the wave propagating in the core is confined there (no refraction) 2nd fo ...
role of phase and group velocities in cerenkov radiation and
... ice [17], noble gases (argon, krypton, xenon) in liquid and solid phase [18, 19, 20], and of NaCl [21] are used to evidence the behaviour of phase and group velocities in materials. The choice of n rather than ng or of v rather than vg leads to errors in track reconstruction and in distance measurem ...
... ice [17], noble gases (argon, krypton, xenon) in liquid and solid phase [18, 19, 20], and of NaCl [21] are used to evidence the behaviour of phase and group velocities in materials. The choice of n rather than ng or of v rather than vg leads to errors in track reconstruction and in distance measurem ...
chapter 8 optical pyrometry
... In lieu of laboratory-type testing in the highly favorable conditions of a black body furnace, one can often approximate a black body in field-type applications; For example, if the surface temperature of an incandescent material in a test rig is required, a small hole can be drilled directly into t ...
... In lieu of laboratory-type testing in the highly favorable conditions of a black body furnace, one can often approximate a black body in field-type applications; For example, if the surface temperature of an incandescent material in a test rig is required, a small hole can be drilled directly into t ...
Three-Dimensional Mapping of Near-Field Interactions via Single-Photon Tomography Benjamin D. Mangum,
... aligned onto an AFM probe; when the excitation polarization is longitudinal, an enhancement in the optical intensity is expected at the tip apex due to a nonresonant lightning-rod effect (i.e., far from any plasmon resonance). Topographical and photon sum signals are recorded simultaneously via the ...
... aligned onto an AFM probe; when the excitation polarization is longitudinal, an enhancement in the optical intensity is expected at the tip apex due to a nonresonant lightning-rod effect (i.e., far from any plasmon resonance). Topographical and photon sum signals are recorded simultaneously via the ...
Optically Enhanced Magnetic Resonance
... angular momentum is laser magnetic resonance. It uses transitions between states that differ both in their electronic or vibrational and angular momentum quantum numbers. Transitions between such states depend on magnetic interactions but fall into the optical frequency range. The population differe ...
... angular momentum is laser magnetic resonance. It uses transitions between states that differ both in their electronic or vibrational and angular momentum quantum numbers. Transitions between such states depend on magnetic interactions but fall into the optical frequency range. The population differe ...
Improving fluorescence detection in lab on chip devices
... catalytic activity or binding affinity.17 Finally, high-resolution fluorescence imaging can reveal structural qualities of macromolecular polymers such as stiffness, shape, and entanglement.18–20 Present state of the art LOC devices are typically fabricated out of glass or PDMS and connected to a fluid ...
... catalytic activity or binding affinity.17 Finally, high-resolution fluorescence imaging can reveal structural qualities of macromolecular polymers such as stiffness, shape, and entanglement.18–20 Present state of the art LOC devices are typically fabricated out of glass or PDMS and connected to a fluid ...
Effect of Macroscopic Structure in Iridescent Color
... not appear for the visible light. Moreover, the angular spread of the scattering wave is suppressed as the result of the destructive interference owing to the flatness of the array. In Fig. 5, we show this effect by a simple simulation where light is incident perpendicularly on the regular array of ...
... not appear for the visible light. Moreover, the angular spread of the scattering wave is suppressed as the result of the destructive interference owing to the flatness of the array. In Fig. 5, we show this effect by a simple simulation where light is incident perpendicularly on the regular array of ...
Semiconductor Lasers: Device Physics and Applications
... Local area optical links are becoming increasingly popular for voice, data, video, digital audio and high definition video transmission. The high modulation bandwidth and large dynamic range of semiconductor lasers make them potential candidates for use in directly modulated optical transmitters. An ...
... Local area optical links are becoming increasingly popular for voice, data, video, digital audio and high definition video transmission. The high modulation bandwidth and large dynamic range of semiconductor lasers make them potential candidates for use in directly modulated optical transmitters. An ...
Slow light in various media: a tutorial
... absorption; hence significant delays of the signal in the slow light are quite possible, while significant advances are difficult to observe because of absorption that not only reduces the energy of the signal but also causes its reshaping, as the slower spectral components of the signal tend to be ...
... absorption; hence significant delays of the signal in the slow light are quite possible, while significant advances are difficult to observe because of absorption that not only reduces the energy of the signal but also causes its reshaping, as the slower spectral components of the signal tend to be ...
prezantacia aj
... Until the connectors are attached, there is no need for twisting or shielding, because no light escapes when it is inside a fiber. This means there are no crosstalk issues with fiber. It is very common to see multiple fiber pairs encased in the same cable. This allows a single cable to be run betwee ...
... Until the connectors are attached, there is no need for twisting or shielding, because no light escapes when it is inside a fiber. This means there are no crosstalk issues with fiber. It is very common to see multiple fiber pairs encased in the same cable. This allows a single cable to be run betwee ...
optical design of an echelle grating based atomic emission
... lines/mm, a ruled area of 254 mm X 128 mm, and a blaze angle of 740. The entrance slit is a square aperture of 40 µm X 40 µm. Mirrors M1 and M2 are 250 mm and 175 mm focal length respectively with aluminium high reflection coatings. The Littrow prism is 35 X 70 X 40 mm3 made of fused silica with alu ...
... lines/mm, a ruled area of 254 mm X 128 mm, and a blaze angle of 740. The entrance slit is a square aperture of 40 µm X 40 µm. Mirrors M1 and M2 are 250 mm and 175 mm focal length respectively with aluminium high reflection coatings. The Littrow prism is 35 X 70 X 40 mm3 made of fused silica with alu ...
Silicon photonics
Silicon photonics is the study and application of photonic systems which use silicon as an optical medium. The silicon is usually patterned with sub-micrometre precision, into microphotonic components. These operate in the infrared, most commonly at the 1.55 micrometre wavelength used by most fiber optic telecommunication systems. The silicon typically lies on top of a layer of silica in what (by analogy with a similar construction in microelectronics) is known as silicon on insulator (SOI).Silicon photonic devices can be made using existing semiconductor fabrication techniques, and because silicon is already used as the substrate for most integrated circuits, it is possible to create hybrid devices in which the optical and electronic components are integrated onto a single microchip. Consequently, silicon photonics is being actively researched by many electronics manufacturers including IBM and Intel, as well as by academic research groups such as that of Prof. Michal Lipson, who see it is a means for keeping on track with Moore's Law, by using optical interconnects to provide faster data transfer both between and within microchips.The propagation of light through silicon devices is governed by a range of nonlinear optical phenomena including the Kerr effect, the Raman effect, two photon absorption and interactions between photons and free charge carriers. The presence of nonlinearity is of fundamental importance, as it enables light to interact with light, thus permitting applications such as wavelength conversion and all-optical signal routing, in addition to the passive transmission of light.Silicon waveguides are also of great academic interest, due to their ability to support exotic nonlinear optical phenomena such as soliton propagation.