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We have controlled the curvature of silicon microlens by changing the amount of photoresist in order to microfabricate hemispherical silicon microlens which can improve the directivity and reduce substrate mode losses.
We present a collection of new, low cost quasi-optical devices for the terahertz range. This includes a liquid-filled lens with variable focus length, lenses and transmission gratings made from micro powders, wave plates made from ordinary copy paper, and an electrically tunable notch filter.
We present a photomixing based continuous wave terahertz single pixel imaging system with quasi instantaneous amplitude and phase detection, allowing us to scan a terahertz image at 1 THz with 0.45 million measurement points in less than 8 min, which is as fast as previously demonstrated at lower frequencies (0.3 THz).
Acute ocular damage threshold of 40 GHz millimeter wave (MMW) exposure was investigated. Pigmented rabbits were exposed unilaterally to 400, 300, 200 or 100 mW/cm2 40 GHz MMW for 6 minutes by a lens antenna under systemic anesthesia. Ocular changes were evaluated by slit-lamp biomicroscopy. Miosis and corneal epithelial damage except corneal stromal opacification were observed immediately after 6...
Quadratic, multi-order diffractive lenses have been designed, fabricated, and demonstrated for the MMW-THz region, with the capability of focusing harmonic wavelengths on to a common focal point. Design wavelength and harmonic spacing can be chosen as design parameters, allowing great flexibility in lens design. Simulations were carried out to determine lens parameters and performance. These lenses...
Diffractive optical elements (polypropylene kinoform diffractive lenses, silicon binary diffractive lenses, and silicon beamsplitters) for the terahertz spectral range have been designed and characterized using high-power terahertz radiation of Novosibirsk free electron laser. The effect of an antireflection coating on the silicon elements was studied.
In this paper, a Lüneburg lens is characterized with millimeter waves. This gradient index lens is used in both transmission and reflection configurations.
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