Photonic crystal waveguides and nanocavities
Two-dimensional photonic crystals embedded in planar waveguides, or photonic crystal slabs, are very suited for the control of light propagation and emission in three dimensions. Confinement in the 2D plane is achieved by the 2D PhC structure, while confinement in the vertical direction is provided by total internal reflection in the high-index slab. A line defect in a 2D PhC slab yields a linear photonic crystal waveguide, while a point defect in a PhC slab behaves as a photonic crystal nanocavity with full 3D confinement.
Our experimental research has been devoted to measurement of photonic band and waveguide mode dispersion by angle-resolved reflectance and attenuated total reflectance with incidence from the PhC slab surface. For examples, we have measured the dispersion of normal W1 waveguides (a missing row of holes in the triangular lattice) and of increased-width waveguides both above and below the light line. Nonlinear optical spectroscopy of III-V and silicon-based photonic crystal waveguides has also been performed. More recently, we have applied the technique of cross-polarized light scattering (also known as resonant scattering) to measure the frequencies and polarization of nano-cavity modes. The effects of random and intentional disorder on linear waveguides and cavity modes are also being studied.
L.C. Andreani, D. Bajoni, M. Belotti, M. Galli, D. Gerace, G. Guizzetti, A.M. Malvezzi, M. Patrini, S. Portalupi
MIUR-FIRB 2003-2005 "Miniaturized systems for electronics and photonics"
D. Bajoni, "Optical Spectroscopy of Photonic Crystals and Microcavities" (University of Pavia, 2004)
G. Vecchi, "Nonlinear Optics in Photonic Crystals" (University of Pavia, 2005)
Far-field emission profiles from L3 photonic crystal cavity modes,
C. Bonato, J. Hagemeier, D. Gerace, S. M. Thon, H. Kim, L. C. Andreani, P. M. Petroff, M. P. van Exter, D. Bouwmeester,
Nonlinear optics in silicon photonic crystal nanocavities,
L. C. Andreani, P. Andrich, M. Galli, D. Gerace, L. O'Faolain, and T. F. Krauss, in
Antibonding ground state in photonic crystal molecules,
N. Caselli, F. Intonti, F. Riboli, A. Vinattieri, D. Gerace, L. Balet, L. H. Li, M. Francardi, A. Gerardino, A. Fiore, and M. Gurioli,
Young's type interference for probing the mode symmetry in photonic structures,
F. Intonti, F. Riboli, N. Caselli, M. Abbarchi, S. Vignolini, D. S. Wiersma, A. Vinattieri, D. Gerace, L. Balet, L. H. Li, M. Francardi, A. Gerardino, A. Fiore, and M. Gurioli
Low-power continuous-wave generation of visible harmonics in silicon photonic crystal nanocavities,
M. Galli, D. Gerace, K. Welna, T. F. Krauss, L. O'Faolain, G. Guizzetti, and L. C. Andreani,
Planar photonic crystal cavities with far-field optimization for high coupling efficiency and quality factor,
S. L. Portalupi, M. Galli, C. Reardon, T. F. Krauss, L. O'Faolain, L. C. Andreani, and D. Gerace,
Light scattering and Fano resonances in high-Q photonic crystal Nanocavities,
M. Galli, S.L. Portalupi, M. Belotti, L.C. Andreani, L. O’Faolain, and T.F. Krauss,
Theoretical and experimental study of the Suzuki-phase photonic crystal lattice by angle-resolved photoluminescence spectroscopy,
A.R. Alija, L.J. Martínez, P.A. Postigo, J. Sánchez-Dehesa, M. Galli, A. Politi, M. Patrini, L.C. Andreani, C. Seassal, and P. Viktorovitch,
Enhanced third-harmonic reflection and diffraction in Silicon on Insulator photonic waveguides,
C. Comaschi, G. Vecchi, A.M. Malvezzi, M. Patrini, G. Guizzetti, M. Liscidini, L.C. Andreani, D. Peyrade, and Y. Chen,
Single-mode versus multimode behavior in silicon photonic crystal waveguides measured by attenuated total reflectance,
M. Galli, D. Bajoni, M. Patrini, G. Guizzetti, D. Gerace, L.C. Andreani, M. Belotti, and Y. Chen,
Excitation of radiative and evanescent defect modes in linear photonic crystal waveguides,
M. Galli, M. Belotti, D. Bajoni, M. Patrini, G. Guizzetti, D. Gerace, M. Agio, L.C. Andreani, and Y. Chen,
Photonic bands in patterned Silicon on Insulator waveguides,
M. Patrini, M. Galli, F. Marabelli, M. Agio, L. C. Andreani, D. Peyrade and Y.Chen,
(feature issue on Photonic Crystals, edited by T.F. Krauss and T. Baba).