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| RESEARCH ACTIVITIES |
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| Porous Silica Based Polarizing Elements for UV Range |
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171. Shinsuke Shichi, Minoru Fujii, Kenji Imakita, and Shinji Hayashi,
Porous silica true zero-order wave plate in the deep ultraviolet range
Optics Communications, Vol.287, pp.137-139 (2013).
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| True zero-order wave plates operating in the deep ultraviolet (DUV) range
are produced from porous silica having very small in-plane optical anisotropy
(refractive index anisotropy: ∼0.001). Small temperature (4.3×10−5λ/°C)
and angle-dependent shifts of the retardance are obtained in the DUV range.
The retardance shifts are 0.007λ and 0.035λ when the plate is tilted 15°
on the [0 0 1] and axes, respectively. From the angle dependence, the shape
of the refractive index ellipsoids is discussed. |
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151. Shinsuke Shichi, Minoru Fujii, and Shinji Hayashi,
Ultraviolet true zero-order wave plate made of birefringent porous silica
Optics Letters, Vol. 36, No. 19, pp. 3951-3953 (2011).
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| Porous Si made from ð110Þ Si wafers exhibits strong in-plane optical anisotropy
(birefringence) in the visible and near-IR ranges. Oxidation of the birefringent
porous Si results in the formation of birefringent porous silica. We demonstrate
that the degree of the birefringence of porous silica can be controlled
by the oxidation condition, and very small birefringence can be achieved.
The smallest anisotropy of the refractive index (Δn) is 0.001, which is
about ten times smaller than that of quartz. The small birefringence allows
us to produce true zero-order wave plates operating in the UV range. |
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