TY - JOUR
T1 - Second harmonic generation due to quadrupole interaction in a photonic crystal slab
T2 - Angle dependence and symmetry of the unit cell
AU - Ishihara, Teruya
AU - Koshino, Kazuki
AU - Nakashima, Hisashi
PY - 2003
Y1 - 2003
N2 - We investigate second harmonic generation (SHG) from a photonic crystal slab consisting of centrosymmetric materials. The SHG signal is observed in the transmission direction when the incident laser excites the quasiwaveguide mode. As the SHG frequency approaches the exciton level, the SHG intensity increases resonantly. When the incident angle is exactly 0, the SHG signal vanishes even if the transmission dip is excited. This fact is readily explained by a quadrupole theory based on the Lorentz oscillator model, where the source of the nonlinearity is the Lorentz force. When the unit cell in the photonic crystal lacks inversion symmetry, the SHG signal is expected even for the normal incidence. It is experimentally demonstrated for a square array of triangular semiconductor slabs.
AB - We investigate second harmonic generation (SHG) from a photonic crystal slab consisting of centrosymmetric materials. The SHG signal is observed in the transmission direction when the incident laser excites the quasiwaveguide mode. As the SHG frequency approaches the exciton level, the SHG intensity increases resonantly. When the incident angle is exactly 0, the SHG signal vanishes even if the transmission dip is excited. This fact is readily explained by a quadrupole theory based on the Lorentz oscillator model, where the source of the nonlinearity is the Lorentz force. When the unit cell in the photonic crystal lacks inversion symmetry, the SHG signal is expected even for the normal incidence. It is experimentally demonstrated for a square array of triangular semiconductor slabs.
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U2 - 10.1103/PhysRevLett.91.253901
DO - 10.1103/PhysRevLett.91.253901
M3 - Article
C2 - 14754116
AN - SCOPUS:0942299556
VL - 91
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 25
ER -