Optical Fiber Sensors for Biomedical Applications
... the tissue. The light source characteristics provide a wide range of properties for optical interrogation of tissues including intensity, phase, polarization state, and wavelength content. 2. Optical fibers deliver light from a light source to a sensing mechanism (see Section 17.2.2 below) located a ...
... the tissue. The light source characteristics provide a wide range of properties for optical interrogation of tissues including intensity, phase, polarization state, and wavelength content. 2. Optical fibers deliver light from a light source to a sensing mechanism (see Section 17.2.2 below) located a ...
Optimal pupil size in the human eye for axial resolution
... beam to obtain axial resolution. In an SLO with an optimally sized confocal pinhole, the effective point-spread function (PSF) is proportional to the square of the intensity of the three-dimensional (3D) point-spread function,7 even when the eye has aberrations.8 The squaring is a direct optical pro ...
... beam to obtain axial resolution. In an SLO with an optimally sized confocal pinhole, the effective point-spread function (PSF) is proportional to the square of the intensity of the three-dimensional (3D) point-spread function,7 even when the eye has aberrations.8 The squaring is a direct optical pro ...
Manipulating atoms with photons (Nobel lecture of C. Cohen
... necessarily accompanied by fluctuations due to the fluorescence photons which are spontaneously emitted in random directions and at random times. These photons communicate to the atom a random recoil momentum \k, responsible for a momentum diffusion described by a diffusion coefficient D (Gordon and ...
... necessarily accompanied by fluctuations due to the fluorescence photons which are spontaneously emitted in random directions and at random times. These photons communicate to the atom a random recoil momentum \k, responsible for a momentum diffusion described by a diffusion coefficient D (Gordon and ...
Module P6.4 Optical instruments
... For example, we may need to magnify the view of an object, if it is too small (using a microscope) or if it is very far away (using a telescope), or we may need a permanent record (obtained using camera), or more information about the colour composition of the light from the object (as revealed by a ...
... For example, we may need to magnify the view of an object, if it is too small (using a microscope) or if it is very far away (using a telescope), or we may need a permanent record (obtained using camera), or more information about the colour composition of the light from the object (as revealed by a ...
Correlation between Optical and Psychophysical Parameters as a
... transfer function, MTF) and psychophysical measurements of visual performance (CSF and VA) under the same conditions. The DP apparatus has been extensively described elsewhere. In summary, the double-pass retinal images were obtained with monochromatic green light (543-nm wavelength) from a He-Ne la ...
... transfer function, MTF) and psychophysical measurements of visual performance (CSF and VA) under the same conditions. The DP apparatus has been extensively described elsewhere. In summary, the double-pass retinal images were obtained with monochromatic green light (543-nm wavelength) from a He-Ne la ...
propagation of light in an optical fiber
... core, or decrease in wavelength) more values of m satisfy the condition and therefore have sustained propagation inside the fiber. The above phase condition can be satisfied only by discrete rays entering the structure i.e. rays at finite number of angles are accepted by the optical fiber. The ensem ...
... core, or decrease in wavelength) more values of m satisfy the condition and therefore have sustained propagation inside the fiber. The above phase condition can be satisfied only by discrete rays entering the structure i.e. rays at finite number of angles are accepted by the optical fiber. The ensem ...
Optical Fibers and Waveguides
... in the slab medium, or core. There are, however, finite field amplitudes that decay exponentially into the external medium. The propagating waves in this case, because they are guided along by the slab, but are not totally confined within it, are often called surface waves. This distinguishes them f ...
... in the slab medium, or core. There are, however, finite field amplitudes that decay exponentially into the external medium. The propagating waves in this case, because they are guided along by the slab, but are not totally confined within it, are often called surface waves. This distinguishes them f ...
Investigation of the presence of rod-shaped bacteria on food surface
... based approach. Very recently, angle-resolved back scattering has been used to identify micro colonies of such bacteria in flow, by matching their known surface textures [11], instead of their individual size, shape, or refractive indices. Bronk presented an extensive description of light-scattering ...
... based approach. Very recently, angle-resolved back scattering has been used to identify micro colonies of such bacteria in flow, by matching their known surface textures [11], instead of their individual size, shape, or refractive indices. Bronk presented an extensive description of light-scattering ...
Strategies for the compensation of specimen
... Wilson, 1990; Pawley, 1995). A fundamental desire for a confocal microscope is therefore the ability to produce high quality diffraction limited images deep within a real specimen. This requirement is at odds with many standard microscope objective lenses that are designed, for example, to image thi ...
... Wilson, 1990; Pawley, 1995). A fundamental desire for a confocal microscope is therefore the ability to produce high quality diffraction limited images deep within a real specimen. This requirement is at odds with many standard microscope objective lenses that are designed, for example, to image thi ...
Nonlinear optics in ultra high Q microcavity 1. Introduction
... scattering[3] in liquids formed from Raman active media such as CS2. However, due to the inefficient nature of free space laser excitation used in these experiments, as well as due to the transient nature of the microdroplets, they required high threshold pump powers and did not allow stable and lon ...
... scattering[3] in liquids formed from Raman active media such as CS2. However, due to the inefficient nature of free space laser excitation used in these experiments, as well as due to the transient nature of the microdroplets, they required high threshold pump powers and did not allow stable and lon ...
Long period grating based biosensor for the detection of Escherichia
... the back scattering electron (BSE) mode of the SEM. The highenergy electrons originating in the incident electron beam back scatter form of the E. coli volume due to the elastic scattering interactions with the E. coli bacterium atoms, which are in turn recorded using an asymmetrical, directional BS ...
... the back scattering electron (BSE) mode of the SEM. The highenergy electrons originating in the incident electron beam back scatter form of the E. coli volume due to the elastic scattering interactions with the E. coli bacterium atoms, which are in turn recorded using an asymmetrical, directional BS ...
Observation of optical polarization Möbius strips
... structures. The preparation of such structured light modes may be important for complex light beam engineering and optical micro- and nanofabrication. ...
... structures. The preparation of such structured light modes may be important for complex light beam engineering and optical micro- and nanofabrication. ...
Superresolution in total internal reflection tomography
... domain or domain of investigation). This a priori information can be used to increase the resolution of the inversion. To avoid the Born approximation, several nonlinear reconstruction procedures such as the conjugate gradient, modified gradient, and hybrid methods19–21 have been developed, especial ...
... domain or domain of investigation). This a priori information can be used to increase the resolution of the inversion. To avoid the Born approximation, several nonlinear reconstruction procedures such as the conjugate gradient, modified gradient, and hybrid methods19–21 have been developed, especial ...
Modeling phase microscopy of transparent three
... Phase microscopy has been used extensively to acquire information about unstained transparent biological objects [1–8]. These objects are visualized well by techniques such as differential interference contrast (DIC) microscopy, but standard DIC systems are qualitative in nature and do not provide q ...
... Phase microscopy has been used extensively to acquire information about unstained transparent biological objects [1–8]. These objects are visualized well by techniques such as differential interference contrast (DIC) microscopy, but standard DIC systems are qualitative in nature and do not provide q ...
Ohmic Contacts With Ultra-Low Optical Loss on Heavily Doped n
... the InP waveguide (WG) layers. They are grown with Metal-Organic Chemical Vapor Deposition (MOCVD) at 650 °C using disilane as the doping gas source. The solubility of Si in the ternary and quaternary alloys is known to be much higher than that in InP [9]. Also, disilane has a higher decomposition r ...
... the InP waveguide (WG) layers. They are grown with Metal-Organic Chemical Vapor Deposition (MOCVD) at 650 °C using disilane as the doping gas source. The solubility of Si in the ternary and quaternary alloys is known to be much higher than that in InP [9]. Also, disilane has a higher decomposition r ...
Silicon optical modulators - Optoelectronics Research Centre
... computing, there is also a plethora of other application areas that will benefit from the success of silicon photonics. These include fibre-to-the-home (FTTH) or fibre-to-the-premises (FTTP), environmental monitoring, biological and chemical sensing, medical and military applications, astronomy etc. ...
... computing, there is also a plethora of other application areas that will benefit from the success of silicon photonics. These include fibre-to-the-home (FTTH) or fibre-to-the-premises (FTTP), environmental monitoring, biological and chemical sensing, medical and military applications, astronomy etc. ...
Rodrigo Aviles‐Espinosa STRATEGIES FOR PUSHING NONLINEAR MICROSCOPY TOWARDS ITS PERFORMANCE LIMITS
... been partially supported by Fundació Cellex Barcelona and has been mostly conducted at ICFO’s “Super-Resolution Light Microscopy and Nanoscopy Facility” (SLN@ICFO). ...
... been partially supported by Fundació Cellex Barcelona and has been mostly conducted at ICFO’s “Super-Resolution Light Microscopy and Nanoscopy Facility” (SLN@ICFO). ...
Optical properties of metals and alloys
... graph and reproduce this manuscript from the microfilm master. UMI films the original text directly from the copy submitted. Thus, some dissertation copies are in typewriter face, while others may be from a computer printer. In the unlikely event that the author did not send UMI a complete manuscrip ...
... graph and reproduce this manuscript from the microfilm master. UMI films the original text directly from the copy submitted. Thus, some dissertation copies are in typewriter face, while others may be from a computer printer. In the unlikely event that the author did not send UMI a complete manuscrip ...
Axial birefringence in high-numerical-aperture optical
... symmetry axis in the plane of incidence.17,18 In this twodimensional problem only p-polarized incident waves, which excite only the extraordinary wave in the uniaxial crystal, are considered. This stands in contrast to this paper, which deals with focusing with rotationally symmetric lenses, making ...
... symmetry axis in the plane of incidence.17,18 In this twodimensional problem only p-polarized incident waves, which excite only the extraordinary wave in the uniaxial crystal, are considered. This stands in contrast to this paper, which deals with focusing with rotationally symmetric lenses, making ...
Fourier-domain holography in photorefractive quantum-well films
... bandwidth imposed by the PSF for the first subsystem is s ⫽ D兾4f in IDH and s ⫽ D兾2f in FDH for coherent illumination, where D is the diameter of the lens. The PRQW device that is used as our holographic recording medium has a limited window size. The limited window acts as a low-pass filter in ...
... bandwidth imposed by the PSF for the first subsystem is s ⫽ D兾4f in IDH and s ⫽ D兾2f in FDH for coherent illumination, where D is the diameter of the lens. The PRQW device that is used as our holographic recording medium has a limited window size. The limited window acts as a low-pass filter in ...
Introduction to optical fibers
... 140 km. The lack of intermodal dispersion does not mean that the pulse distortion disappear completely. Non-linear chromatic dispersion (which will be discussed in Chapter 3) as well as attenuation caused by dispersion and absorption of glass, which the core is built of, cause distortion and attenua ...
... 140 km. The lack of intermodal dispersion does not mean that the pulse distortion disappear completely. Non-linear chromatic dispersion (which will be discussed in Chapter 3) as well as attenuation caused by dispersion and absorption of glass, which the core is built of, cause distortion and attenua ...
University of Groningen CURVATURE MEASUREMENT
... practice. The measuring devices, called (optical) spherometers (lens surfaces commonly have a spherical shape), all are different types of reflected-light microscopes. Here, a simple spherometrical method is introduced, which can be executed with any standard microscope equipped with an epi-illumina ...
... practice. The measuring devices, called (optical) spherometers (lens surfaces commonly have a spherical shape), all are different types of reflected-light microscopes. Here, a simple spherometrical method is introduced, which can be executed with any standard microscope equipped with an epi-illumina ...
Raman Scattering in Solids
... highly collimated and polarized beam of light with a power of typically 1…100 mW coming from one of various types of lasers which normally provide several lines throughout the visible and near infrared or ultraviolet spectral range. As the intensity of the light has to be extremely stable as a funct ...
... highly collimated and polarized beam of light with a power of typically 1…100 mW coming from one of various types of lasers which normally provide several lines throughout the visible and near infrared or ultraviolet spectral range. As the intensity of the light has to be extremely stable as a funct ...
Guiding light with conformal transformations
... methods described here. All of the following discussion assumes that waveguide bends are bounded by PEC sidewalls. Figure 2(a) shows the spatially varying relative permittivity ε/εr for a circular beam or waveguide bend, determined computationally by the conformal module of Eq. (1) and specified by ...
... methods described here. All of the following discussion assumes that waveguide bends are bounded by PEC sidewalls. Figure 2(a) shows the spatially varying relative permittivity ε/εr for a circular beam or waveguide bend, determined computationally by the conformal module of Eq. (1) and specified by ...
Optical coherence tomography
Optical coherence tomography (OCT) is an established medical imaging technique that uses light to capture micrometer-resolution, three-dimensional images from within optical scattering media (e.g., biological tissue). Optical coherence tomography is based on low-coherence interferometry, typically employing near-infrared light. The use of relatively long wavelength light allows it to penetrate into the scattering medium. Confocal microscopy, another optical technique, typically penetrates less deeply into the sample but with higher resolution.Depending on the properties of the light source (superluminescent diodes, ultrashort pulsed lasers, and supercontinuum lasers have been employed), optical coherence tomography has achieved sub- micrometer resolution (with very wide-spectrum sources emitting over a ~100 nm wavelength range).Optical coherence tomography is one of a class of optical tomographic techniques. A relatively recent implementation of optical coherence tomography, frequency-domain optical coherence tomography, provides advantages in signal-to-noise ratio, permitting faster signal acquisition. Commercially available optical coherence tomography systems are employed in diverse applications, including art conservation and diagnostic medicine, notably in ophthalmology and optometry where it can be used to obtain detailed images from within the retina. Recently it has also begun to be used in interventional cardiology to help diagnose coronary artery disease. It has also shown promise in dermatology to improve the diagnostic process.