We present the results of numerical and experimental studies of spatial and temporal separation of femtosecond light
pulses in 1D photonic crystals (PC) in Laue diffraction geometry. The porous silicon PC are fabricated by
electrochemical etching using and contain 400 pairs of alternating layers with optical thickness 600 and 680 nm, so that
the center of the photonic band gap is placed at about 2600 nm. Spatial splitting of the laser pulse into two, one of them
corresponding to the transmitted beam and the second - to the diffracted one, are observed. It is shown that the diffraction
angle of the second beam changes when the wavelength of light is tuning, in accordance with the theoretical estimations.
This work describes the infiltration of a polymeric solution into porous Si structures towards the fabrication of
tunable photonic crystals (PC) and microcavities for photonics applications. The tunability is achieved by infiltrating the
porous silicon based PCs by active organic materials, such as an emissive and nonlinear polymer called 2-methoxy-5-(2-
ethylhexyloxy)-p-phenylenevinylene (namely MEH-PPV). This preliminary work shows the infiltration of this polymeric
solution into PC based on macroporous Si structure as well as in microcavities based on multiple layers of microporous
Si. The solidification of the polymer was obtained by the evaporation of the solvent. Various techniques of infiltration
were studied to obtain an optimized filling of the pores. The infiltration was then characterized using photoluminescence
measurements. Finally, we will report on the study of third harmonic generation (THG) in samples of porous silicon
microcavity infiltrated with MEHPPV. The k-domain THG spectroscopy was applied and an increase of the THG
intensity up to an order of magnitude was achieved for the filled microcavity.
KEYWORDS: Luminescence, Near field scanning optical microscopy, Silicon, Optical microcavities, Spectroscopy, Near field, Photonic crystals, Near field optics, Silicon photonics, Argon ion lasers
Photoluminescence spectroscopy of porous silicon photonic crystal microcavities is studied by the far-field and near-field robes using the apertureless scanning near-field optical microscope. Narrow microcavity mode with the spectral width of 10nm in far-field spectra and broad photoluminescence peak with the spectral width of 50nm in near-field spectra of microcavity samples is observed. It has been studied some correlations between near-and far-field spectra of porous silicon structures.
KEYWORDS: Luminescence, Near field optics, Near field scanning optical microscopy, Near field, Photonic crystals, Silicon, Optical microcavities, Spectroscopy, Scattering, Optical fibers
The spatial distribution of the local optical field in the photonic crystal (PC) microcavities (MC) formed from porous silicon and in MC doped by fluorescent dye is studied by apertureless scanning near-field optical microscope (SNOM). To increase fluorescence up to 100 times photonic crystals are doped by fluorescence dye Rhodamin 6G. Photoluminescence spectroscopy of porous silicon photonic crystal MC is studied by far-field and near-field probes. The spatial distribution of optical field at the cleaved edge of MC is observed in
near-field scattering and photoluminescence. The image of the spatial distribution of local optical field in near-field fluorescence at the wavelength of local optical maximum of fluorescence spectra shows the localization of radiation in MC layer.
The spatial distribution of the local optical field at the cleavage of photonic crystal smicrocavity has been obtained by the scanning near-field optical microscope (SNOM). The localization of optical radiation at microcavity resonant wavelength in the vicinity of the λ/2 spacer layer is demonstrated. Samples of photonic crystal microcavity are prepared from silicon wafer by electrochemical etching technique. The wavelength of the microcavity mode is optimized for resonance with wavelengths of lasers. The image of the spatial distribution of optical field at the cleaved edge of the facing vertically microcavity is observed. Sample is pumped through external single-mode fiber perpendicularly to the microcavity. SNOM
operates in the collection mode with the apertureless tip. We observe the localization of the resonant optical field in microcavity but we do not reveal such localization of the radiation at the non-resonant wavelength.
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