Temporal evolution of the angular response of a PVA/acrylamide photopolymer
... points on the same diffraction efficiency curve. In order to determine the angular response at different points of the same diffraction efficiency curve, it is necessary to obtain various holograms with diffraction efficiencies corresponding to different points on the same graph and determine the an ...
... points on the same diffraction efficiency curve. In order to determine the angular response at different points of the same diffraction efficiency curve, it is necessary to obtain various holograms with diffraction efficiencies corresponding to different points on the same graph and determine the an ...
H. F. Ghaemi - Department of Physics | Oregon State
... We identify the transmission minima as the result of Wood’s anomaly,11 which was observed in diffraction gratings and occurs when a diffracted order becomes tangent to the plane of the grating. When the order disappears, the light intensity is redistributed among the remaining orders; it has been su ...
... We identify the transmission minima as the result of Wood’s anomaly,11 which was observed in diffraction gratings and occurs when a diffracted order becomes tangent to the plane of the grating. When the order disappears, the light intensity is redistributed among the remaining orders; it has been su ...
Limits on Spin-Charge Separation from h 2e Fluxoids in Very
... The h兾2e flux quantization was best established by the SQUID measurements, supplemented by the Hall probe to study temperature dependence. For consistency, we also used integration and fits to determine F of fluxoids in the Hall probe images. The integration had a large error associated with the flu ...
... The h兾2e flux quantization was best established by the SQUID measurements, supplemented by the Hall probe to study temperature dependence. For consistency, we also used integration and fits to determine F of fluxoids in the Hall probe images. The integration had a large error associated with the flu ...
Joule Expansion Imaging Techniques on Microlectronic Devices
... micrometric thermocouples deposited on the surface of the device[2] are not adapted to this kind of samples as they offer a bad spatial resolution (5 to 10 µm minimum) regarding the device dimensions. Moreover, a thermocouple implies a contact with the sample that can damage it or disrupt its functi ...
... micrometric thermocouples deposited on the surface of the device[2] are not adapted to this kind of samples as they offer a bad spatial resolution (5 to 10 µm minimum) regarding the device dimensions. Moreover, a thermocouple implies a contact with the sample that can damage it or disrupt its functi ...
Dynamic lighting system for specular surface inspection
... Defects appear as high gray level pixels. In order to perform a simple segmentation processing, we have to obtain a mean image with defects very contrasted with regard to the flawless area of the surface by imaging a minimum of necessary images. The contrast between the defects zones and the rest of ...
... Defects appear as high gray level pixels. In order to perform a simple segmentation processing, we have to obtain a mean image with defects very contrasted with regard to the flawless area of the surface by imaging a minimum of necessary images. The contrast between the defects zones and the rest of ...
LATTICE IMAGING IN TRANSMISSION ELECTRON MICROSCOPY
... non-periodic character of nanostructures. Only fast electrons are scattered sufficiently strongly with matter to provide local information at the atomic scale. One of the most commonly used high-resolution techniques in transmission electron microscopy (TEM) is that of (bright-field) phase-contrast ...
... non-periodic character of nanostructures. Only fast electrons are scattered sufficiently strongly with matter to provide local information at the atomic scale. One of the most commonly used high-resolution techniques in transmission electron microscopy (TEM) is that of (bright-field) phase-contrast ...
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... The theory of DWS makes the connection between temporal intensity fluctuations of the speckle field emerging from the sample and the dynamics of the particles in the sample. In this section, we present the basic result of DWS and highlight some of the assumptions commonly associated with DWS. This i ...
... The theory of DWS makes the connection between temporal intensity fluctuations of the speckle field emerging from the sample and the dynamics of the particles in the sample. In this section, we present the basic result of DWS and highlight some of the assumptions commonly associated with DWS. This i ...
10 fs ultrafast all-optical switching in polystyrene nonlinear photonic
... surface of the substrate, namely, the ⌫ − L crystalline direction is perpendicular to the surface. Although the opal photonic crystal does not have a complete band gap due to low index contrast, it suffices to only consider a directional band gap along ⌫ − L direction for current purpose. The measur ...
... surface of the substrate, namely, the ⌫ − L crystalline direction is perpendicular to the surface. Although the opal photonic crystal does not have a complete band gap due to low index contrast, it suffices to only consider a directional band gap along ⌫ − L direction for current purpose. The measur ...
Coherence properties of light propagated through a
... The experimental set-up used to obtain the MOI and the GR of the wavefield is shown in Figure 1. The light radiated from a single-mode fibre-coupled Superluminescent Diode (SLD) (Superlum Ltd. Model 505) with a central wavelength of 681 nm and a linewidth of 12 nm was collimated using a microscope o ...
... The experimental set-up used to obtain the MOI and the GR of the wavefield is shown in Figure 1. The light radiated from a single-mode fibre-coupled Superluminescent Diode (SLD) (Superlum Ltd. Model 505) with a central wavelength of 681 nm and a linewidth of 12 nm was collimated using a microscope o ...
Spectroscopic Imaging using Terahertz Time-Domain Signals
... extended their work to also extract the thickness, but only high index materials were considered [16]. In this work, we propose a new technique to determine simultaneously the thickness and the complex index of refraction of an unknown material. The THz-TDS system provides a time-domain signal of th ...
... extended their work to also extract the thickness, but only high index materials were considered [16]. In this work, we propose a new technique to determine simultaneously the thickness and the complex index of refraction of an unknown material. The THz-TDS system provides a time-domain signal of th ...
3D widefield light microscopy with better than 100 nm axial resolution
... without need for scanning, allowing much higher speeds and/or larger image areas. We acquire a 512 × 512 × 160 pixel data set in 10–20 min; to acquire a data set of that size using a typical 4Pi confocal microscope with a pixel dwell time of 2 ms (Schrader et al., 1998) would take almost ...
... without need for scanning, allowing much higher speeds and/or larger image areas. We acquire a 512 × 512 × 160 pixel data set in 10–20 min; to acquire a data set of that size using a typical 4Pi confocal microscope with a pixel dwell time of 2 ms (Schrader et al., 1998) would take almost ...
Rejection of two-photon fluorescence background in
... focal spot should lie roughly at the same location as the unaberrated focal spot. Constraints on the applied aberrations are therefore that they produce no defocus nor tilt to the illumination intensity. For our demonstrations, we applied voltages on the DM actuators to produce either 0 or π local p ...
... focal spot should lie roughly at the same location as the unaberrated focal spot. Constraints on the applied aberrations are therefore that they produce no defocus nor tilt to the illumination intensity. For our demonstrations, we applied voltages on the DM actuators to produce either 0 or π local p ...
Cost-effective optical coherence tomography spectrometer based on
... demonstrated and depict a reasonable image quality for this preliminary low cost system that is well comparable to competing devices. Further improvement of the optical design and the TFBG fabrication process have potential to optimize the TFBG spectrometer towards smaller size and higher efficiency ...
... demonstrated and depict a reasonable image quality for this preliminary low cost system that is well comparable to competing devices. Further improvement of the optical design and the TFBG fabrication process have potential to optimize the TFBG spectrometer towards smaller size and higher efficiency ...
Novel 3-D microscopy techniques - Purdue University Cytometry
... p - pulse duration f p - repetition rate δ2 - 2p cross - section Pav - average power of the beam λ - wavelengt h ...
... p - pulse duration f p - repetition rate δ2 - 2p cross - section Pav - average power of the beam λ - wavelengt h ...
Wavelength verification of laser through varied slit widths using a
... In this set-up, the light was seen to be a wave. The key to understanding why light behaves like waves is through interference and diffraction. Both are the phenomena that distinguish waves from particles: waves interfere and diffract while particles do not (Boston University, n.d.). Thus, the study ...
... In this set-up, the light was seen to be a wave. The key to understanding why light behaves like waves is through interference and diffraction. Both are the phenomena that distinguish waves from particles: waves interfere and diffract while particles do not (Boston University, n.d.). Thus, the study ...
A negative permeability material at red light
... silver mirror, respectively. In the TE regime the electric field of the incident light was linearly polarized parallel to the length of silver strips, while in TM mode the electric field was rotated 90 degrees relative to TE case. For example, Figs. 2(b) and 2(c) show transmission and reflection spe ...
... silver mirror, respectively. In the TE regime the electric field of the incident light was linearly polarized parallel to the length of silver strips, while in TM mode the electric field was rotated 90 degrees relative to TE case. For example, Figs. 2(b) and 2(c) show transmission and reflection spe ...
Direct Laser Writing: Versatile Tool for Microfabrication of Lithium
... the sample surface during recording, and was polarized linearly along the c-axis. According to qualitative in situ observations of the writing process, optical contrast of the written lines did not change when the angle between the linearly polarized writing beam and the c-axis was varied. This obse ...
... the sample surface during recording, and was polarized linearly along the c-axis. According to qualitative in situ observations of the writing process, optical contrast of the written lines did not change when the angle between the linearly polarized writing beam and the c-axis was varied. This obse ...
Wavefront retrieval of amplified femtosecond
... Eq. (1) was obtained for monochromatic plane waves, it still can be used in a first order approximation to estimate the spectral intensity of the SH signal generated by a femtosecond laser pulse. It is reasonable for moderate intensities (in order to neglect higher-order nonlinear effects), for crys ...
... Eq. (1) was obtained for monochromatic plane waves, it still can be used in a first order approximation to estimate the spectral intensity of the SH signal generated by a femtosecond laser pulse. It is reasonable for moderate intensities (in order to neglect higher-order nonlinear effects), for crys ...
Science Service Provider for Elucidation of Protein Function and
... from its FASTA sequence. This data is useful in optimizing conditions for crystallization. The output will be helpful and suggestive for the optimization of the crystallization condition from the aspect of ionic composition of each solution. ...
... from its FASTA sequence. This data is useful in optimizing conditions for crystallization. The output will be helpful and suggestive for the optimization of the crystallization condition from the aspect of ionic composition of each solution. ...
The Optical Beam Diameter Within the Beam
... distance √(λz)=6.6mm. A Gaussian beam of this size will expand in diameter by a factor of √2 over 20m of propagation distance, and initially uniform beams will look more like an Airy pattern than a sharp-edged disk. It is the fact that the beam is nearly in an image plane which causes the high SNR: ...
... distance √(λz)=6.6mm. A Gaussian beam of this size will expand in diameter by a factor of √2 over 20m of propagation distance, and initially uniform beams will look more like an Airy pattern than a sharp-edged disk. It is the fact that the beam is nearly in an image plane which causes the high SNR: ...
Optics Ic
... Throughout the following experiments we will return to this basic design law many times. Then we will turn to the quantitative evaluation of images formed by general purpose lenses of several types. We will explore the limitations of lenses in forming images. There are two main limitations. First, t ...
... Throughout the following experiments we will return to this basic design law many times. Then we will turn to the quantitative evaluation of images formed by general purpose lenses of several types. We will explore the limitations of lenses in forming images. There are two main limitations. First, t ...
Upholding the diffraction limit in the focusing of light and sound
... of focusing using materials with negative permittivity and permeability developed by Veselago [8] to show that focusing of light to a subwavelength spot (in theory, to a point) is possible with a slab of a double-negative material = =-1 (i.e., refractive index n=-1). Pendry’s ‘superlens’ see ...
... of focusing using materials with negative permittivity and permeability developed by Veselago [8] to show that focusing of light to a subwavelength spot (in theory, to a point) is possible with a slab of a double-negative material = =-1 (i.e., refractive index n=-1). Pendry’s ‘superlens’ see ...
Research Article Influence of Thickness on the Holographic Parameters of H-PDLC Materials
... (PIPS) in which the liquid crystal molecules diffuse to dark zones in the diffraction grating where they can be oriented by means of an electric field. The orientation of the liquid crystal produces a refractive index variation which changes the diffraction efficiency. Therefore, the grating develop ...
... (PIPS) in which the liquid crystal molecules diffuse to dark zones in the diffraction grating where they can be oriented by means of an electric field. The orientation of the liquid crystal produces a refractive index variation which changes the diffraction efficiency. Therefore, the grating develop ...
Large-angle quasi-self-collimation effect in a rod
... vector in the air), r12 is the reflection coefficient of the ARL in the air and r23 is the reflection coefficient of the semi-infinite quasi-SC PC when the light beam is hitting the PC surface from air. Both r12 and r23 can be calculated by applying the multiple scattering method[14]. Now, we try to ...
... vector in the air), r12 is the reflection coefficient of the ARL in the air and r23 is the reflection coefficient of the semi-infinite quasi-SC PC when the light beam is hitting the PC surface from air. Both r12 and r23 can be calculated by applying the multiple scattering method[14]. Now, we try to ...