Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text T. V. Dolgova, P. P. Vabishchevich, V. O. Bessonov, F. Y. Sychev, M. R. Shcherbakov, and A. A. Fedyanin, "Surface-plasmon relaxation dynamics in planar plasmonic crystals," in IONS 8, (Optica Publishing Group, 2010), paper IPM2. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

Temporal modification of femtosecond laser pulses reflected from planar periodic metal nanostructures with resonant excitation of surface plasmon-polaritons is experimentally studied. Spectral time-resolved measurements of the second-order cross-correlation function performed with the pulse duration comparable with the surface plasmon-polariton relaxation time (about 100 fs) show the strong spectral dependence of the envelope of the reflected femtosecond pulse described by Fano-resonance parameters.

A vertical hybrid microcavity is fabricated by sandwiching a polymer layer between distributed Bragg reflectors (DBRs) composed of porous silicon photonic crystals. The DBRs are made by electrochemical etching of Si and consist of alternating porous Si layers of high and low porosity, the top DBR being a freestanding film. The hybrid microcavity demonstrates a deep microcavity mode placed within a 200 nm wide photonic band gap, and reveals a many-fold enhancement of the third-order nonlinearity of the microcavity layer. The fabrication technique employed is rather simple, enabling the use of a variety of functional materials as the microcavity spacer.

Optical second-harmonic (SH) generation in porous-silicon-based photonic microcavities is observed in the form of hyper-Rayleigh scattering (HRS), with the SH radiation being diffuse and depolarized. Infiltration of sodium nitrite into the pores essentially suppresses HRS and results in generation of specular and partially polarized SH. Dissimilarly, the third-harmonic (TH) radiation from both unfilled and infiltrated samples is specular and polarized. These results indicate different spatial localization of the SH and TH sources.

Spectral tuning of photonic band gap (PBG) in photonic crystals is attained due to temperature changes of the refractive index of sodium nitrite infiltrated into the porous silicon template, composed by electrochemical etching of n-type silicon. Optical second harmonic generation measurements prove the ferroelectric state of the infiltrated NaNO2 and reveal the ferroelectric behavior different from spinning films of sodium nitrite that is attributed to nanocrystalline and surface effects of NaNO2 inside porous silicon matrix. The tuning of PBG up to 15 nm is achieved in the temperature interval from 50degC to 200degC.

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.

Nanostructured one-and three-dimensional magnetophotonic crystals are produced by infiltration of yttrium-iron garnet with bismuth into photonic crystals based on porous silicon and artificial opals. The magnetic properties of the resulting structures are studied by generation of the magnetically induced second harmonics. The magnetic contrast of the second harmonics intensity in the spectral region of the photonic gap edge of the photonic crystal is 10–15%.

One-dimensional photonic crystals containing yttrium iron garnet are designed and studied by reflectance spectroscopy and second-harmonic generation spectroscopy. Second-harmonic generation enhancement and nonlinear magneto-optical Kerr effect are observed.

Photonic crystals (PC) based on porous n-Si are fabricated and their structural, optical, and nonlinear optical properties are studied. The n-Si based PC composed of five pairs of layers with alternate porosity reveal a rather broad photonic band gap (PBG) of more than 100 nm and a reflectivity of up to 0.75. An average pore diameter of approximately 90 nm is found in n-Si based PC in contrast to mesoporous p-Si based PC, where pores are approximately 15 nm in diameter. Second-harmonic generation (SHG) spectroscopy reveals the enhancement of the SHG intensity by a factor of 102 at the blue edge of the PBG spectra which is attributed to the fulfillment of the phase matching conditions and the localization of the fundamental optical field in the PC.

The first results obtained in the synthesis of one-dimensional ferroelectric photonic crystals based on nanostructured lead zirconate titanate and porous silicon are reported. The samples synthesized are studied using linear reflection and second optical harmonic spectroscopy.