The vectorial method of lines is applied to the longitudinal discontinuities of slab waveguides. The analysis includes reflections, radiation losses and absorption by lossy dielectrics. In spite of the generality of t...
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The vectorial method of lines is applied to the longitudinal discontinuities of slab waveguides. The analysis includes reflections, radiation losses and absorption by lossy dielectrics. In spite of the generality of the analysis the numerical effort is low and implementation on a computer is easy.
It has been shown that Oliner models, traditionally used for the analysis of microwave integrated circuits, can be applied to the calculation of electrodynamic characteristics of elements for coupling open resonators ...
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It has been shown that Oliner models, traditionally used for the analysis of microwave integrated circuits, can be applied to the calculation of electrodynamic characteristics of elements for coupling open resonators with rectangular waveguides. The experiments have indicated a high accuracy with the calculation technique developed.
Changes in refractive index and in film thickness caused by synchrotron radiation are studied in a fluorinated polyimide (6FDA/TFDB). The index at 589.6 nm increased by 1.3% and the thickness decreased by 0.69% for 8-...
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Changes in refractive index and in film thickness caused by synchrotron radiation are studied in a fluorinated polyimide (6FDA/TFDB). The index at 589.6 nm increased by 1.3% and the thickness decreased by 0.69% for 8-mu m-thick film after 30 min irradiation. X-ray photoelectron spectroscopy analysis was performed on the modified surfaces after synchrotron radiation exposure. From the present data the synchrotron radiation leads to production of a fluorine-poor surface. (C) 1996 American Vacuum Society.
Micrometer-sized bumps were formed on a glass surface using a focused femtosecond laser processing in water. The bumps were formed over a wide ranges of pulse irradiation parameters, including irradiation energy and f...
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Micrometer-sized bumps were formed on a glass surface using a focused femtosecond laser processing in water. The bumps were formed over a wide ranges of pulse irradiation parameters, including irradiation energy and focus position. The bumps exhibited a wide variety of morphologies and sizes depending on the parameters. The use of a liquid, namely heavy water, which returns after breakdown and cavitation bubble formation, enabled us to fabricate bumps with high spatial density, which is not possible using a solid coating that is ablated. A desired arrangement of bumps on a glass surface was fabricated by tuning the processing time interval to be more than the disappearance time of a bubble, generated by focusing a femtosecond laser pulse near the water/glass interface.
Coupled optical microresonators are one way of slowing down light. A new record has now been set for the length of these slow-light waveguides using an array of more than 100 photonic-crystal cavities.
Coupled optical microresonators are one way of slowing down light. A new record has now been set for the length of these slow-light waveguides using an array of more than 100 photonic-crystal cavities.
Focused ion beam milling is used to fabricate micron and submicron scale patterns in sintered silica colloidal crystal films. Rectangular cavities with both solid and porous boundaries, fluidic channels, and isolation...
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Focused ion beam milling is used to fabricate micron and submicron scale patterns in sintered silica colloidal crystal films. Rectangular cavities with both solid and porous boundaries, fluidic channels, and isolation of a small number of packed spheres are patterned. The ion beam can pattern sintered films of individual submicron size spheres and create patterns that cover up to 40 mu m in less than 15 min. The experiments in this work indicate that the amount of redeposited material on the surface of a milled cavity determines whether the surface will be porous or solid. FIB direct patterning has applications in colloidal crystal based lithography, integrated photonic devices, optofluidic devices, and micrototal-analytical systems.
We analyze an important aspect of the behavior of surface plasmon polariton (SPP) Bragg mirrors: the dependence of the angular acceptance for reflection on the incidence angle. By means of leakage radiation microscopy...
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We analyze an important aspect of the behavior of surface plasmon polariton (SPP) Bragg mirrors: the dependence of the angular acceptance for reflection on the incidence angle. By means of leakage radiation microscopy, both in direct and Fourier space, we observe that the angular acceptance diminishes for increasing incidence angles. This effect, which can considerably affect the design of devices based on these elements, is shown to be the consequence of the decrease of the bandgap width with increasing incidence angle. (c) 2007 Optical Society of America.
We show a unique technique to form dense dislocations locally inside a MgO single crystal with a rock-salt type structure using femtosecond (fs) laser irradiation. Cross-shaped patterns of micrometer size, originating...
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We show a unique technique to form dense dislocations locally inside a MgO single crystal with a rock-salt type structure using femtosecond (fs) laser irradiation. Cross-shaped patterns of micrometer size, originating from densely introduced dislocations, are formed spontaneously around the focal point. We controlled the three-dimensional propagation of the dislocations by adjusting the pulse energy of the fs laser and NA of objective lens. The technique may open up a new field of dislocation technology for optical applications.
We demonstrate Mach-Zehnder interferometers (MZI) assembled using optical microfibers or nanofibers (MNFs) drawn from silica fibers and tellurite glasses. As-assembled MZIs, with dimensions of tens to hundreds of micr...
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We demonstrate Mach-Zehnder interferometers (MZI) assembled using optical microfibers or nanofibers (MNFs) drawn from silica fibers and tellurite glasses. As-assembled MZIs, with dimensions of tens to hundreds of micrometers, show good interference fringes with extinction ratios of similar to 10 dB. The path-length difference of the MZI can be tuned by micromanipulation under an optical microscope. The MNF-assembled MZIs demonstrated here show advantages of easy fabrication, in situ tunability, and compact size. (c) 2008 Optical Society of America.
The E-mode cutoff wave numbers of circular waveguide loaded with dielectric sectors were evaluated theoretically using the null-field formulation. These values are found to agree closely with cutoff wave numbers measu...
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The E-mode cutoff wave numbers of circular waveguide loaded with dielectric sectors were evaluated theoretically using the null-field formulation. These values are found to agree closely with cutoff wave numbers measured by using the transverse resonance technique.
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