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This paper presents the plane wave excitation of the optical leaky waveguide antenna (OLWA) by the taper array and offset parabolic reflector to obtain high antenna gain. The taper array is composed of 12 slow tapers, and obtain high aperture efficiency. The parabolic reflector enables small size as compared with the taper array. We compare the performance of these excitation methods for the wide...
This paper presents an optical leaky waveguide antenna, i.e., waffled waveguide (WWG). From both simulations and experiments, we evaluate the effectiveness of the WWG in terms of the antenna characteristics. The WWG radiates a narrow beam tilted by sweeping the incident wavelength, and consists of an array of small rectangular holes fabricated by silicon photonics. Compared to the conventional grating...
This paper presents experimental performance of Optical Leaky Wave Antenna (OLWA) using waffle waveguide (WWG). The antenna is fabricated by silicon photonics technology to achieve high directivity gain leaky waveguide antenna with small perturbation parameter of WWG. Narrow beam and one-dimensional beam scanning is demonstrated by sweeping input wavelength of OLWA. The measured WWG performance is...
Increasing trends of dissolved Si measured by a colorimetric method and ICP (DSicol and DSiICP, respectively) and total Si concentrations were detected at the center of Lake Kasumigaura during 1980–2006 (mean DSicol concentration in the 1980s and 2000s was 1.3 and 4.0 mg l−1, respectively). The observation of such trends is rare; therefore, the elucidation of the causes could be useful to understanding...
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