Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 52: Optical properties & Photonic crystals

HL 52.11: Talk

Friday, March 16, 2018, 12:15–12:30, EW 201

Wafer-scale metallic two-dimensional superlattice photonic crystals for light trapping — •Rui Xu, Huaping Zhao, and Yong Lei — Am Ehrenberg 2, 98693 ilmenau

Two-dimensional (2D) superlattice PhCs of alumina are found to be formed when preparing perfectly-ordered porous alumina membranes by anodizing surface-nanopatterned aluminium foils. Through a two-step replication process, we successfully replace alumina with metals (e.g., nickel, gold, silver, cobalt) to obtain wafer-scale metallic 2D superlattice PhCs. The geometrical and structural parameters of metallic 2D superlattice PhCs can be precisely tuned based on those of alumina counterparts, and finally leading to tailorable light trapping properties. As an example, nickel 2D superlattice PhCs can achieve stably strong (over 90%) light absorption below the steep cut-off wavelength which is controlled in the wavelength range of 600 - 1500 nm. Numerical simulations and systematic experiments reveal that the surface plasmon resonance and cavity resonance stemming from both nanopores and nanoconcaves are fundamentally responsible for light trapping.