We considered luminescent TiO 2 films whose surface was imprinted with a two-dimensional (2-D) square shaped photonic crystal with different pattern depths (from 20 to 61 nm). The aim of this work is to develop a straightforward method to characterize the PhC efficiency on light extraction. Transmission spectra of the patterned areas as obtained using a routine spectrometer exhibit peaks evidencing the coupling by the photonic crystal structure of free-space light with guided modes within the film, in good agreement with 2-D rigorous-coupled wave analysis (RCWA) simulations. As expected, the deeper the pattern depth, the stronger the coupling between the guided light and the photonic crystal. RCWA simulations allow evaluating quantitatively the extraction length, characteristic of the efficiency of light extraction, from the transmission spectra, in good agreement with direct measurements.
Considering luminescent TiO2 films whose surface was imprinted with a 2D square shaped photonic crystal with different pattern depths (from 20 to 61 nm), we demonstrate the possibility to use simple absorption measurements to evaluate the efficiency of light extraction. Absorption spectra of the patterned systems show absorption peaks, evidencing the coupling between the photonic crystal structure and light guided within the film, in good agreement with 2D-RCWA simulations. The deeper the pattern depth, the stronger the coupling between the guided light and the photonic crystal. Using RCWA simulations, we show that it is possible to evaluate the extraction length, characteristic of the efficiency of light extraction, from the absorption spectra, in good agreement with direct measurements reported elsewhere.
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