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Several theoretical approaches, different from their viewpoints to optical near-field problems, have been proposed for a decade. The essential points in difference are related to what the optical near-field interaction is, or how materials respond to light confined in a small area less than the wavelength. The so-called classical approach that is based on the macroscopic Maxwell equations extends...
Light-matter interactions on the nanometer scale have been extensively studied to reveal their fundamental physical properties [1–3], as well as their impact on a wide range of applications, such as nanophotonic devicesnanophotonic devices [4], sensing [5], and characterization [6]. Fabrication technologies have also seen rapid progress, for example, in controlling the geometry of matter, such as...
Recent developments in near-field optical microscopy have made it possible to obtain optical images with nanometer-scale spatial resolution by scanning a fiber probe with a sub-wavelength aperture [1]. In attempts to improve performance in spatially resolved spectroscopy, a serious problem of the fiber probe is its low throughput (in the case of illumination-mode operation, the throughput is defined...
Manipulating atoms with freedom has been one of any scientist’s dreams for a long time. Atoms have been used as a measure of whether quantum mechanics is correct. As is well known, the frequency and wavelength of light emitted from a Cs atom or a Rb atom are adopted as standards of time and length. For these purposes, gaseous atoms are often used. However, such atoms move about actively with high...
Optical near fields have been used in high-resolution microscopy/spectroscopy for a variety of samples [1], especially for a single molecule [2] and a single quantum dot [3], as well as for nanofabrication [4]–[6]. These applications are based on the fact that optical near-field probes, whose tips are sharpened to a few nanometers, can generate a light field localized around the apex of the same order...
The basis of the near-field optical microscope (NOM) is short-range electromagnetism between two antennas, a probe antenna and a sample antenna, which are much smaller than the wavelength of the driving field [1,2]. It is apparent that fabricating and manipulating small antennas are the most important factors in the successful development of NOM. One of the most realistic and commonly used methods...
A significant decrease in the decay time of the emission from a dipole-forbidden state in a GaAs quantum-ring was observed, using the near-field interaction induced by the close proximity of an apertured fiber probe tip.
The superradiance had been predicted by Dicke in 1954 theoretically [1] and observed in atomic and molecular systems experimentally [2]. In the recent experiments, the superradiance and superfluorescence by nano-structures of solid-state materials such as an ensemble of quantum dots were observed [3, 4]. The superradiance by solid-state materials has advantage for the application of devices as compared...
We developed a self-assembly method for alignment of ZnO quantum dots (QDs) into a straight line. The polarization dependence of photoluminescence intensity revealed the signal transmission via an optical near-field along the QD chain.
The scratches on the surface of Al2O3 ceramics were repaired by optical near-field assisted sputtering with laser irradiation of 473-nm wavelength in a self-organized manner. Their average depth decreased from 3.2 nm to 0.79 nm.
Nanophotonics is defined, and a physical picture of dressed photons is presented. Room-temperature nanophotonic logic gates and related devices are demonstrated. An application for an optical router system is also reviewed.
For future optical transmission systems with high data transmission rates and capacity, we have proposed nanometer-scale photonic devices (i.e., nanophotonics devices). These devices consist of nanometer-scale dots, and an optical near-field is used as the signal carrier.
We demonstrate system architectures for nanophotonics that enable optical near-field interactions in the nanometer-scale expolited for ultra-high density system integrations beyond the diffraction limit of light and achieving novel functionalities in information and communications applications.
The development of a new recycling technology for waste concrete scraps becomes a big issue in Japan due to the increase of the scraps and the decrease of the natural coarse aggregates. In the present work, a new technology of concrete aggregates recycling using pulsed discharges was performed. A Marx generator was used as a pulsed power source and a point to hemisphere mesh configuration electrode...
Japan, the recycling ratio of concrete scraps has been kept over 95% after the Law for the Recycling of Construction Materials was enforced in 2000. On the other hand, it is predicted to be difficult to keep this higher recycling ratio in the near future because concrete scraps increase rapidly. Therefore, new way to reuse concrete scraps must be developed. In this paper, a new method for recycling...
In Japan, the treatment of waste concrete scraps has been one of the environmental issues. Therefore, the new application using pulsed power technology has been developed as the recycling method of coarse aggregates in waste concrete scraps. In the work, the dependences of the quality of the recycled coarse aggregate on the consumption energy and gap distance were investigated and the best condition...
We report nanophotonic energy up-conversion operation in ZnO nanorod double-quantum-well structures assisted by the optical absorption of phonons via an optical near-field.
Two sizes of ZnO quantum dots with resonant energy levels were mixed to confirm the energy transfer and resultant energy conversion using time-resolved photoluminescence spectroscopy. The energy transfer time was found to be 130 ps.
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