Regensburg 2004 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 12: Poster I

HL 12.29: Poster

Montag, 8. März 2004, 16:30–19:00, Poster A

Trimming of two dimensional photonic crystal structures — •Markus Schmidt¹, Gunnar Boettger¹, Karolin Preusser-Mellert¹, Manfred Eich¹, Uwe Huebner², and Hans-Georg Meyer² — ¹Technische Universitaet Hamburg-Harburg, AB 4-09, Eissendorfer Str. 38, D-21073 Hamburg — ²Institut fuer Physikalische Hochtechnologie Jena e. V., Abt. Kryoelektronik, Winzerlaer Str. 10 D-07745 Jena

We present a new concept to adjust the transmission properties of a two dimensional photonic crystal based on photobleaching. A square lattice of 500 nm lattice constant and 300 nm hole diameter was fabricated by etching air holes into a slab waveguide consisting of a polymethylmethacrylate polymer covalently functionalized with 10 mol % of the Disperse Red 1 chromophore. While illuminating the photonic crystal with UV light the azo molecule bonds degenerate, resulting in a considerable refractive index change and a slightly reduced slab waveguide core layer thickness. Wavelength and polarization dependent measurements show that the dielectric band edge can be shifted strongly, achieving maximum shifts of 35 nm in TE and 27 nm in TM polarization. Bleaching of a finite 2d-resonator results in a 22 nm higher resonance wavelength. In practical applications much smaller shifts are needed to tune Dense Wavelength Division Multiplexing (DWDM) - devices. Our novel concept therefore allows to compensate fabrication inaccuracies and to trim photonic crystal transmission properties.