Opal-ZnO nanocomposites: structure and emission properties

Dergachov²,

Shvachich³

et al. 2010

Ukr. J. Phys. Opt.

Spontaneous emission of laser dye molecules (rhodamine 6G and pironin G) embedded into pores of synthetic opal photonic crystals is studied in the spectral region of 520-650 nm. It is ascertained that the emission spectra are greatly dependent on the photonic stop-band position and the spectral distribution of photon density of states. A dependence of spectral position of the emission band from the dielectric contrast is found. PACS:78.67-n , 78.55.Mb UDC: 535.361

Section: Introductionmentioning

confidence: 99%

Spontaneous emission of laser dye molecules in synthetic opals under conditions of low dielectric contrast

Dergachov²,

Shvachich³

et al. 2010

Ukr. J. Phys. Opt.

“…Synthetic opals made of SiO 2 globules demonstrate pronounced stop-band for the light propagating along <111> direction and modification of the photon density of states near the stop-band. Owing to possibility for changing their optical properties by infiltrating them with various substances, these materials have long been under extensive experimental study [4][5][6]. The emission of initial synthetic opal photonic crystals (SOPC) observed under ultraviolet excitation has been interpreted in terms of enhanced Raman and parametric scattering [7,8].…”

Section: Introductionmentioning

confidence: 99%

The possibility for surface-enhanced Raman scattering and spontaneous parametric down-conversion by globular photonic crystals infiltrated with dielectrics

Dergachov²,

Shvachich³

et al. 2009

Ukr. J. Phys. Opt.

Emission of globular SiO 2 photonic crystals infiltrated with dielectrics is observed within a wide spectral region under excitation with the light wavelength λ = 400 nm. The first part of the emission spectrum located in the vicinity of the excitation line depends on infiltrated substance and is explained by surface-enhanced Raman scattering effect. The second one lying in the region of 440-650 nm that includes the stop-band is caused by spontaneous parametric down-conversion. PACS:78.67-n + 78.55.Mb UDC: 535.361

“…Effects of light localisation (John, 1987;Kaliteevskii et al, 2005;Vignolini et al, 2008).  Radiation of photonic crystals filled with organic (rhodamine 6G, 1,8-naphthoylene-1',2'-benzimidazole, stilbene) and inorganic (ZnO, ZnS, rare-earth ions Eu 3+ , Tb 3+ , Er 3+ ) luminophores near by the edges of photonic band-gap (Gaponenko et al, 1999;Aliev et al, 2002;Emel'chenko et al, 2005;Li et al, 2007).  Radiation of CdTe, CdSe/ZnS quantum dots in photonic crystal volume (Gruzintsev et al, 2009;Ambrozevich et al, 2009).…”

mentioning

confidence: 99%

Quantum Optics Phenomena in Synthetic Opal Photonic Crystals

Quantum Optics and Laser Experiments

Dergachov²

2012

Quantum Optics and Laser Experiments 88 allows modifying optical properties of such systems by filling the pores with various substances. Synthetic opal photonic crystals containing nonlinear optical substances give a good chance to observe quantum optics phenomena in spatially nonuniform media where the photon mean free path is close to the light wavelength. Moreover, in this case the input optical power that is necessary to observe phenomena may be lower than the power required usually for observing the same phenomena in uniform nonlinear substances. The reason for it is the existence of diffuse transfer of photons that can result in photon accumulating inside photonic crystals and, consequently, in local optical power increasing. In particular, the possibility of experimental manifestation of Raman scattering and spontaneous parametric down-conversion in synthetic opals is discussed (Gorelik, 2007). The latter phenomenon is of special interest as it is convenient method to obtain bi-photon fields consisting of correlated photon pairs (Kitaeva & Penin, 2005). In the recent years, crystals with chirped structure of quadratic susceptibility (Kitaeva & Penin, 2004), and materials with spatially regular and stochastic distribution of quadratic optical susceptibility (Kalashnikov et al., 2009), are considered as sources of bi-photons. It is quite possible synthetic opal photonic crystals will be ranked with these sources.