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Laser array beam propagation through liver tissue
摘要： Laser array beam propagating through mouse liver tissue is investigated. The turbulence power spectrum of the liver tissue is employed in the extended Huygens–Fresnel method to obtain an optical intensity pro?le and beam broadening at the observation point in biological liver tissue. Variations of the beam pro?le and the beam broadening are simulated based on the number of beamlets, source size, wavelength and the ring radius of the array. A biological tissue, illuminated by the laser array beam, exhibits different beam pro?les and beam spot radius variations when the number of beamlets, source size, wavelength and the ring radius of the laser array beam are varied. Examining these variations observed in the propagated optical beam and comparing them with the test cases, abnormalities such as cancer and tumor in a biological liver tissue can be diagnosed.
关键词： Optical wave propagation,Tissue turbulence,Effective beam spot radius,Optical intensity,Optical imaging
更新于2025-09-23 15:19:57
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Derivation and Experimental Verification of the near-field 2D and 3D optical intensities from a finite-size light emitting diode (LED)
摘要： We derive the near-field light intensity distributions of an inorganic LED on its surface and in volumetric space. Our closed-form solution for 3D intensity distribution for a finite-size LED is consistent with Lambert’s Cosine Law, which provides the 3D intensity distribution for an infinitesimal, flat light source. We also derive the formula for the 2D intensity distribution on a diode surface showing its similarity to a Gaussian function, which is typically used to approximate the surface light intensity profile for an LED and a laser diode. Our 2D intensity distribution function produces light propagation similar to the Gaussian beam propagation in space. However, unlike the Gaussian approximation, our formula invariably produces this behavior without assuming the refractive index inside the diode follows a quadratic function of the transverse spatial domains. Our 2D and 3D spatial intensity formulas in near-field for LEDs offer a unique way to calculate the peak intensity that occurs at the center of the flat LED source. We demonstrate, as expected, that the peak intensity increases with the size of the LED source as well as the brightness of each radiative electron-hole pair, which is a function of the drive current and quantum efficiency of the LED.
关键词： Near-field Photometry,Optical Waveguides,Display,Optical Wave Propagation,Closed-Form Solutions,and Lighting.,Lasers,Light Emitting Diodes,Mathematical Physics
更新于2025-09-16 10:30:52
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Fiber Optic and Atmospheric Optical Communication || Optical Wave Propagation
摘要： Electromagnetic (EM) wave plays a key role in modern communication systems, radio and optical, including optical telecommunication systems. Therefore, fiber optic or laser communications emphasize the EM phenomena described mathematically by Maxwell’s unified theory, which we will consider in detail subsequently. Investigation of optical communications started just after the invention of the laser in 1960. Atmospheric propagation of optical waves was investigated parallelly with improvements in optical lasers and understanding of the problems of optical wave’s generation both in the time and space domains. Thus, problems with weather, line-of-site (LOS) clearance, beam spreading and bending in the real atmosphere consisting of gaseous structures (aerosols, fog, smoke, turbulence, etc.), and hydrometeors (snow, rain, clouds, etc.) eliminated free-space optical communication as a major aspect in wireless communication.
关键词： Optical Wave Propagation,Maxwell’s Equations,Atmospheric Propagation,Electromagnetic Waves,Fiber Optic Communication
更新于2025-09-11 14:15:04
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RADIATION FIELD AND OPTICAL COUPLING EVALUATION USING A NEW MATHEMATICAL MODEL
摘要： The mathematical model elaborated in this paper is based on the concept of intrinsic modes in order to analyze and synthesize optical wave propagation along a non-uniform optical structure which is used in integrated optics communication as tapered optical coupler. The new mathematical model is simply developed by introducing modi?cations to the intrinsic integral, and its numerical evaluation illustrates the electromagnetic ?eld distribution inside a taper thin ?lm and also outside the waveguide constituted by the substrate and the cladding of lower refractive index. The proposed method permits e?ciently tracking the behaviour of the optical waves both inside and outside the optical waveguide, and quantifying the radiation and optical coupling occurring from the taper thin ?lm of higher refractive index to adjacent mediums until a total energy transfer; this happens at thicknesses lower than waveguide cuto? thickness of each mode. The new model can be applied to all types of tapered optical coupler, made from di?erent optical materials and having di?erent wedge angles.
关键词： intrinsic modes,tapered optical coupler,mathematical model,optical wave propagation,electromagnetic ?eld distribution,radiation and optical coupling
更新于2025-09-04 15:30:14