Direct measurement of terahertz wavefront pulses using 2D electro
... plane. From this phase mapping, it is possible to calculate the surface of equi-phase, which constitutes the definition of the wavefront. To illustrate our method, we measured the optical aberrations of the THz beam presented in Fig. 1a, which is supposed to have a planar wavefront. The result is pr ...
... plane. From this phase mapping, it is possible to calculate the surface of equi-phase, which constitutes the definition of the wavefront. To illustrate our method, we measured the optical aberrations of the THz beam presented in Fig. 1a, which is supposed to have a planar wavefront. The result is pr ...
3-nitroaniline and 3-nitrophenol – A novel non linear optical material
... and petroleum ether as a solvent. The structural, vibrational and second-order nonlinear optical properties of the crystals were studied under application of the polarized UV-induced field. Besides the ab initio quantum chemical calculations have been performed at HF/6-31G (d) and time dependent DFT ...
... and petroleum ether as a solvent. The structural, vibrational and second-order nonlinear optical properties of the crystals were studied under application of the polarized UV-induced field. Besides the ab initio quantum chemical calculations have been performed at HF/6-31G (d) and time dependent DFT ...
485-146 - Wseas.us
... transfer function is changed from stop-band to pass-band mode (Fig.1). Similar results can be obtained in the case of average refractive index discontinuity. For instance, If the average refractive index n0 of the homogeneous grating transforms into n0 + n/2 for the first half of the grating and n ...
... transfer function is changed from stop-band to pass-band mode (Fig.1). Similar results can be obtained in the case of average refractive index discontinuity. For instance, If the average refractive index n0 of the homogeneous grating transforms into n0 + n/2 for the first half of the grating and n ...
Bending What is Optical Fiber Dispersion?
... Multimode fibers can guide many different light modes since they have much larger core size. Each mode enters the fiber at a different angle and thus travels at different paths in the fiber. ...
... Multimode fibers can guide many different light modes since they have much larger core size. Each mode enters the fiber at a different angle and thus travels at different paths in the fiber. ...
Plasmonics Seminar Report
... collective motion of large numbers of electrons. Plasma is a medium with equal concentration of positive and negative charges, of which at least one charge type is mobile. In as solid, the negative charges of the conduction electrons are balanced by an equal concentration of positive charge of the i ...
... collective motion of large numbers of electrons. Plasma is a medium with equal concentration of positive and negative charges, of which at least one charge type is mobile. In as solid, the negative charges of the conduction electrons are balanced by an equal concentration of positive charge of the i ...
Visualization of optical deflection and switching operations by a
... HF:HNO3=1:2 acid mixture at room temperature. This acid mixture etches the z– face much faster than the z+ face. On a zoomed scale, the interface shows evident lack of homogeneities, but locally it seems to be smooth enough for the construction of our devices. ...
... HF:HNO3=1:2 acid mixture at room temperature. This acid mixture etches the z– face much faster than the z+ face. On a zoomed scale, the interface shows evident lack of homogeneities, but locally it seems to be smooth enough for the construction of our devices. ...
SI - ECE@NUS
... calculation, the incident light beam is regarded as a bundle of N optical rays (N was of the order of several thousands in our calculations), each ray carrying m photons with a momentum of mp and energy of mE0. Here p and E0 are the momentum and energy carried by a photon. Then, the momentum cha ...
... calculation, the incident light beam is regarded as a bundle of N optical rays (N was of the order of several thousands in our calculations), each ray carrying m photons with a momentum of mp and energy of mE0. Here p and E0 are the momentum and energy carried by a photon. Then, the momentum cha ...
5. Stable manipulation on the interface by negative force
... calculation, the incident light beam is regarded as a bundle of N optical rays (N was of the order of several thousands in our calculations), each ray carrying m photons with a momentum of mp and energy of mE0. Here p and E0 are the momentum and energy carried by a photon. Then, the momentum cha ...
... calculation, the incident light beam is regarded as a bundle of N optical rays (N was of the order of several thousands in our calculations), each ray carrying m photons with a momentum of mp and energy of mE0. Here p and E0 are the momentum and energy carried by a photon. Then, the momentum cha ...
Microscopy Basics
... Bright field microscopy is based on absorption of light in the sample. Most biological objects, however, absorb only weakly in the visible spectrum. This lead to: • Development of specific staining (nowadays almost entirely replaced by fluorescent labeling) • Development of UV microscopy (Köhler) fa ...
... Bright field microscopy is based on absorption of light in the sample. Most biological objects, however, absorb only weakly in the visible spectrum. This lead to: • Development of specific staining (nowadays almost entirely replaced by fluorescent labeling) • Development of UV microscopy (Köhler) fa ...
K.C. Neuman and S.M. Block, "Optical Trapping"
... requires expansion to overfill the back aperture of the objective. For a Gaussian beam, the beam waist is chosen to roughly match the objective back aperture. A simple Keplerian telescope is sufficient to expand the beam (lenses L1 and L2). A second telescope, typically in a 1 : 1 configuration, is ...
... requires expansion to overfill the back aperture of the objective. For a Gaussian beam, the beam waist is chosen to roughly match the objective back aperture. A simple Keplerian telescope is sufficient to expand the beam (lenses L1 and L2). A second telescope, typically in a 1 : 1 configuration, is ...
Reflectivity measurements of a quantum well
... - halogen lamp – a source of broadband light - aperture – changes the convergent beam coming out of the halogen lamp into divergent imitating the point source and extracting the center of the light spot which has the biggest intensity being most homogeneous at the same time; its position coincides w ...
... - halogen lamp – a source of broadband light - aperture – changes the convergent beam coming out of the halogen lamp into divergent imitating the point source and extracting the center of the light spot which has the biggest intensity being most homogeneous at the same time; its position coincides w ...
CavityRingDown_Acous..
... the aperture smaller so the beams don’t overlap, measure the rise time and peak diffraction efficiency (not diffracted power, but ratio of diffracted output to input) as a function focal spot size, varied inversely ¢ = ¸F=A by opening and closing the aperture A (or perhaps by z-shifting the AOD). No ...
... the aperture smaller so the beams don’t overlap, measure the rise time and peak diffraction efficiency (not diffracted power, but ratio of diffracted output to input) as a function focal spot size, varied inversely ¢ = ¸F=A by opening and closing the aperture A (or perhaps by z-shifting the AOD). No ...
Total Reflection X-Ray Fluorescence Spectrometer
... with the increase in the angular divergence, which is tolerable for TXRF to a limited extent only. The possibility to improve the divergence by means of an additional curved mirror was reported in the past. One may hope that this additional mirror corrects some of the adverse characteristics of the ...
... with the increase in the angular divergence, which is tolerable for TXRF to a limited extent only. The possibility to improve the divergence by means of an additional curved mirror was reported in the past. One may hope that this additional mirror corrects some of the adverse characteristics of the ...
Fiber optics for laser cooling and trapping
... Fiber optics for laser cooling and trapping Combining and collimating multiple laser beams for manipulating atoms Over the last two decades, the interest in the investigation of atoms at ultralow temperatures has increased substantially, as is reflected in the number of Nobel prizes awarded during t ...
... Fiber optics for laser cooling and trapping Combining and collimating multiple laser beams for manipulating atoms Over the last two decades, the interest in the investigation of atoms at ultralow temperatures has increased substantially, as is reflected in the number of Nobel prizes awarded during t ...
Two-state Optical Filter Based on Micromechanical
... remaining sub-elements are attached to the substrate. The suspended subelements are mechanically connected to a frame, which is again connected to the substrate through narrow beams that function as springs. A single filter device consists of an arbitrary number of frames. The component used for tes ...
... remaining sub-elements are attached to the substrate. The suspended subelements are mechanically connected to a frame, which is again connected to the substrate through narrow beams that function as springs. A single filter device consists of an arbitrary number of frames. The component used for tes ...
Fluidic Optics - Whitesides Group
... An additional characteristic of dynamic fluidic systems is ease with which the liquids can be replaced and/or replenished continuously. This capability for replenishment allows injection of liquids with different properties (e.g., index of refraction, absorption, fluorescence) to tune the optical ou ...
... An additional characteristic of dynamic fluidic systems is ease with which the liquids can be replaced and/or replenished continuously. This capability for replenishment allows injection of liquids with different properties (e.g., index of refraction, absorption, fluorescence) to tune the optical ou ...
In Situ Imaging of Cold Atomic Gases
... been developed and implemented within the past two decades to image dense atomic clouds, not only in situ, but also non-destructively. In this letter we present two of these methods (dark-ground imaging and phase contrast imaging) and propose a new, third method that is designed to image few-atom cl ...
... been developed and implemented within the past two decades to image dense atomic clouds, not only in situ, but also non-destructively. In this letter we present two of these methods (dark-ground imaging and phase contrast imaging) and propose a new, third method that is designed to image few-atom cl ...
Free Space Optical communication
... Scintillation is caused by solar energy heating up small air pockets inhomogenously, thereby creating varying refractive index along the FSO link [7]. This results in the scattering of laser beams at various angles along the propagation path and a resultant fluctuation in both the intensity and phas ...
... Scintillation is caused by solar energy heating up small air pockets inhomogenously, thereby creating varying refractive index along the FSO link [7]. This results in the scattering of laser beams at various angles along the propagation path and a resultant fluctuation in both the intensity and phas ...
Precession optomechanics - EECS @ UMich
... expected forces are if light is prevented from deflecting from its original trajectory, e.g. by being guided in a helical fiber. Roughly speaking, we can say that if light is bounded in its propagation in a bent fiber, then the precessing photon would “want” to deflect from its original trajectory ...
... expected forces are if light is prevented from deflecting from its original trajectory, e.g. by being guided in a helical fiber. Roughly speaking, we can say that if light is bounded in its propagation in a bent fiber, then the precessing photon would “want” to deflect from its original trajectory ...
Optical Data Storage: The past, present, and a possible future
... It is my goal to introduce how optical data storage originated, and progressed to the point it is now. Further more, I will look at what improvements must be made in future technologies to facilitate a creating a competitive product for data storage. We will find that far field optics will have to b ...
... It is my goal to introduce how optical data storage originated, and progressed to the point it is now. Further more, I will look at what improvements must be made in future technologies to facilitate a creating a competitive product for data storage. We will find that far field optics will have to b ...
Get PDF - OSA Publishing
... Here, we consider light transmission at normal incidence through square arrays of gold gammadia. The optical response is analyzed in the far field for all possible polarization states in terms of the Mueller matrix (M). Two square arrays of gold nanostructures were fabricated using electron beam lit ...
... Here, we consider light transmission at normal incidence through square arrays of gold gammadia. The optical response is analyzed in the far field for all possible polarization states in terms of the Mueller matrix (M). Two square arrays of gold nanostructures were fabricated using electron beam lit ...
Optical tweezers
Optical tweezers (originally called ""single-beam gradient force trap"") are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch to physically hold and move microscopic dielectric objects similar to tweezers. Optical tweezers have been particularly successful in studying a variety of biological systems in recent years.