Berlin 2005 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 62: Photonische Kristalle IV
HL 62.1: Vortrag
Mittwoch, 9. März 2005, 10:45–11:00, TU P164
A novel technique for near-field mapping of photonic crystal eigenmodes — •F. Intonti1, C. Ropers2, M. Colocci1, C. Lienau2, P. Bettotto3, and L. Pavesi3 — 1LENS, 50019 Sesto Fiorentino (FI), Italy — 2Max-Born-Institut für Nichtlineare Optik undKurzzeitspektroskopie, 12489 Berlin — 3Università di Trento, 38100 Trento, Italy
Photonic crystals (PCs) are predicted to drastically influence the light propagation (1) and these predictions are currently actively tested by experiments. Most studies probe the band structure by analyzing amplitudes of scattered electromagnetic waves (2) and thus provide only indirect microscopic information about the optical modes of the PC. Near-field optical microscopy allows for a direct spatial imaging of these modes. So far, however, only few near-field studies have been reported, mainly due to inherent experimental difficulties.
Here, we report a novel, efficient and easy-to-use technique for near-field mapping of PC eigenmodes. The technique is based on non-metalized dielectric near-field probes and can be applied in a wide wavelength range from 400 to > 2000 nm. Experiments at λ=1.55 µm, probing the the local reflectance from periodically ordered air pores in a crystalline silicon matrix, demonstrate an optical resolution of less than λ/5 and are well reproduced by numerically solving the PC master equation.