Surface Water Waves
... electromagnetic waves through the use of new materials could lead to seemingly impossible feats. These include cloaking devices and perfect optical lenses free from chromatic aberrations. Using metamaterials they would enable light of visible wavelengths to be deflected around an object and continue ...
... electromagnetic waves through the use of new materials could lead to seemingly impossible feats. These include cloaking devices and perfect optical lenses free from chromatic aberrations. Using metamaterials they would enable light of visible wavelengths to be deflected around an object and continue ...
Two-state Optical Filter Based on Micromechanical
... with grating light valves (GLV) [2], and is a special case of a group of optical MEMS devices using phase-controlled arrays of reflectors [3]. II. D ESIGN The two-state CDOE can be viewed as grating light valves operated in a high (m > 1) diffraction order. Reducing the light intensity at one wavele ...
... with grating light valves (GLV) [2], and is a special case of a group of optical MEMS devices using phase-controlled arrays of reflectors [3]. II. D ESIGN The two-state CDOE can be viewed as grating light valves operated in a high (m > 1) diffraction order. Reducing the light intensity at one wavele ...
Phase contrast microscopy (PCM) represents a major breakthrough
... in enhancing contrast than the dark field method. Instead of removing the unscattered light completely, in phase contrast some DC field is maintained, but is placed in quadrature (/2 out of phase) with the scattered component. Perhaps an entertaining analogy can be drawn between phase contrast ad m ...
... in enhancing contrast than the dark field method. Instead of removing the unscattered light completely, in phase contrast some DC field is maintained, but is placed in quadrature (/2 out of phase) with the scattered component. Perhaps an entertaining analogy can be drawn between phase contrast ad m ...
An Optical ‘‘Janus’’ Device for Integrated Photonics By Xiang Zhang*
... elements into the same footprint. Electromagnetic waves passing through a physical space can be caused to experience a predetermined virtual space by modifying the underlying material properties in a spatial manner. This is possible because of the invariance of Maxwell’s equations[3–5] under a spati ...
... elements into the same footprint. Electromagnetic waves passing through a physical space can be caused to experience a predetermined virtual space by modifying the underlying material properties in a spatial manner. This is possible because of the invariance of Maxwell’s equations[3–5] under a spati ...
Active semiconductor-based grating waveguide structures
... for changing the refractive index in semiconductor materials that can be applied to form an active GWS. The refractive index change is induced by applying an external electric field and by changing the free charge carrier density. By properly controlling material properties (e.g., the energy bandgap ...
... for changing the refractive index in semiconductor materials that can be applied to form an active GWS. The refractive index change is induced by applying an external electric field and by changing the free charge carrier density. By properly controlling material properties (e.g., the energy bandgap ...
Diffraction Free Beams
... Comparison between the focal depth reached by A) the fluorescence excited by a Gaussian beam B) the fluorescence excited by an equivalent Bessel Beam ...
... Comparison between the focal depth reached by A) the fluorescence excited by a Gaussian beam B) the fluorescence excited by an equivalent Bessel Beam ...
optical_phenomena
... Here tree and buildings on a distant shore line appear taller than they really are. They've effectively been stretched vertically. (Here's the source of this image) ...
... Here tree and buildings on a distant shore line appear taller than they really are. They've effectively been stretched vertically. (Here's the source of this image) ...
Applications of Surface Metrology to Issues in Art
... identification and preservation of art material in collaboration with the Worcester Art Museum (WAM) and Worcester Polytechnic Institute Surface Metrology Lab. We have talked to two people from the Worcester Art Museum conservation lab, Phil Klausmeyer and a colleague to see if they would be interes ...
... identification and preservation of art material in collaboration with the Worcester Art Museum (WAM) and Worcester Polytechnic Institute Surface Metrology Lab. We have talked to two people from the Worcester Art Museum conservation lab, Phil Klausmeyer and a colleague to see if they would be interes ...
Biosensing under an applied voltage using optical waveguide
... Prior to use, an ITO coated sensor chip is soaked for ca. 24 h in deionized water (without protein) in order to avoid a signal drift due to gradual filling of the porous waveguiding film with solvent (Ramsden, 1994). The sensor chip is inserted into the flow cell assembly, which is then mounted to t ...
... Prior to use, an ITO coated sensor chip is soaked for ca. 24 h in deionized water (without protein) in order to avoid a signal drift due to gradual filling of the porous waveguiding film with solvent (Ramsden, 1994). The sensor chip is inserted into the flow cell assembly, which is then mounted to t ...
At-wavelength figure metrology of hard x
... hard x-ray microscopy, microdiffraction, and spectromicroscopy using a hard x-ray microprobe have the ability to analyze materials nondestructively with precise spatial information. In these techniques, not only the focusing size of the hard x rays, but also the focusing intensity distribution prope ...
... hard x-ray microscopy, microdiffraction, and spectromicroscopy using a hard x-ray microprobe have the ability to analyze materials nondestructively with precise spatial information. In these techniques, not only the focusing size of the hard x rays, but also the focusing intensity distribution prope ...
Index of Refraction (IoR) Technology for
... buffer preparation to chromatography and sanitization require liquid chemical concentration and temperature monitoring to optimize and ensure process performance. Errors in chemical concentration at any process step can result in loss of high-value product, reduced product quality/efficacy and reduc ...
... buffer preparation to chromatography and sanitization require liquid chemical concentration and temperature monitoring to optimize and ensure process performance. Errors in chemical concentration at any process step can result in loss of high-value product, reduced product quality/efficacy and reduc ...
Review and Comparison of High
... system. However, the single predicted exposure time does not always fit the surface with a large range of reflectivity variation, for example, the surface on the metallic workpiece shown in Figure 2. In 2014, a similar approach was presented by Zhong et al. [16], which selects an optimal exposure ti ...
... system. However, the single predicted exposure time does not always fit the surface with a large range of reflectivity variation, for example, the surface on the metallic workpiece shown in Figure 2. In 2014, a similar approach was presented by Zhong et al. [16], which selects an optimal exposure ti ...
High-speed spectral-domain optical coherence tomography at 1.3
... tissue properties [2]. Since clinically viable broadband sources are limited in power, high speed operation of TD-OCT with axial scan (A-line) acquisition rates beyond 10-kHz may be impractical due to insufficient sensitivity. Optical tomographic imaging using frequency domain ranging has recently a ...
... tissue properties [2]. Since clinically viable broadband sources are limited in power, high speed operation of TD-OCT with axial scan (A-line) acquisition rates beyond 10-kHz may be impractical due to insufficient sensitivity. Optical tomographic imaging using frequency domain ranging has recently a ...
Waves Revision
... • By this means, energy gets transferred from one place to another by the wave ...
... • By this means, energy gets transferred from one place to another by the wave ...
Large acceptance of non-collinear phase
... Second-harmonic generation (SHG) is one of the most appealing parametric processes in nonlinear optics and the conversion efficiency of SHG depends crucially on the phase-matching relations between the fundamental and SHG. Conventionally, these conditions can be achieved by taking advantages of two ...
... Second-harmonic generation (SHG) is one of the most appealing parametric processes in nonlinear optics and the conversion efficiency of SHG depends crucially on the phase-matching relations between the fundamental and SHG. Conventionally, these conditions can be achieved by taking advantages of two ...
Dispersion Compensation using a Prism-pair
... The generation of ultrashort pulses [1, 2] revolutionized the field of molecular spectroscopy [3]. Not only that ultrashort pulses enable to observe molecular motion in time [4, 5, 6], but they allow also to manipulate their dynamics [7, 8, 9] by controlling the spectral properties of the pulses. Fo ...
... The generation of ultrashort pulses [1, 2] revolutionized the field of molecular spectroscopy [3]. Not only that ultrashort pulses enable to observe molecular motion in time [4, 5, 6], but they allow also to manipulate their dynamics [7, 8, 9] by controlling the spectral properties of the pulses. Fo ...
High-resolution retinal microscopy using MEMS
... made using microelectromechanical (MEMS) systems technology has enabled rapid development of adaptive optics in several new applications. In this paper, the design and testing of a retinal imaging system is detailed, with an emphasis on the adaptive optical components and their performance. Retinal ...
... made using microelectromechanical (MEMS) systems technology has enabled rapid development of adaptive optics in several new applications. In this paper, the design and testing of a retinal imaging system is detailed, with an emphasis on the adaptive optical components and their performance. Retinal ...
Optical Analogues for Massless Dirac Particles and Conical
... as shown in Fig. 3(a). The parameters of the writing procedure can be found in [24]. The sample consists of 40 sinusoidally shaped waveguides with alternating distances between adjacent lattice sites equal to d1 ¼ 13:9 m and d2 ¼ 18:1 m, that are written into a 10 cm long fused silica wafer. The c ...
... as shown in Fig. 3(a). The parameters of the writing procedure can be found in [24]. The sample consists of 40 sinusoidally shaped waveguides with alternating distances between adjacent lattice sites equal to d1 ¼ 13:9 m and d2 ¼ 18:1 m, that are written into a 10 cm long fused silica wafer. The c ...
Surface plasmon resonance microscopy
Surface Plasmon Resonance Microscopy (SPRM) is a label free analytical tool that combines the surface plasmon resonance of metallic surfaces with imaging of the metallic surface.The heterogeneity of the refractive index of the metallic surface imparts high contrast images, caused by the shift in the resonance angle.SPRM can achieve a thickness sensitivity of few tenths of nanometer and lateral resolution achieves values of micrometer scale.SPRM is used to characterize surfaces, self-assembled monolayers, multilayer films, metal nanoparticles, oligonucleotides arrays, binding and reduction reactions.Surface Plasmon polaritons are surface electromagnetic waves coupled to oscillating free electrons of a metallic surface that propagate along a metal/dielectric interface.Since polaritons are highly sensitive to small changes in the refractive index of the metallic material,it can be used as a biosensing tool that does not require labeling. SPRM measurements can be made in real-time.Wang and collaborators studied the binding kinetics of membrane proteins in single cells.The experimental setup of an SPRM can be seen in the Figure 1, where an adherent cell is grown on a gold film and placed in an inverted microscope, p-polarized light was used to create the surface plasmons on the gold film and a CCD camera was used to create the SPR image.