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We measure the refractive index and the absorption of porous silicon layers in the millimetric and submillimetric wavelength range using the terahertz time-domain spectroscopy technique. For the studied range of porosity (55%–76%), the refractive index of porous silicon is rather well described by mixture theories, in which the refractive index of bulk silicon enters as a main parameter. © 1998 American Institute of Physics.
Published in:
Journal of Applied Physics
(Volume:83
,
Issue:
11
)
Date of Publication: Jun 1998