Room-temperature emission at telecom wavelengths from silicon photonic crystal nanocavities
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Strongly enhanced light emission at wavelengths between 1.3 and 1.6 μm is reported at room temperature in silicon photonic crystal (PhC) nanocavities with optimized out-coupling efficiency. Sharp peaks corresponding to the resonant modes of PhC nanocavities dominate the broad sub-bandgap emission from optically active defects in the crystalline Si membrane. We measure a 300-fold enhancement of the emission from the PhC nanocavity due to a combination of far-field enhancement and the Purcell effect. The cavity enhanced emission has a very weak temperature dependence, namely less than a factor of 2 reduction between 10 K and room temperature, which makes this approach suitable for the realization of efficient light sources as well as providing a quick and easy tool for the broadband optical characterization of silicon-on-insulator nanostructures.
Lo Savio , R , Portalupi , S L , Gerace , D , Shakoor , A , Krauss , T F , O'Faolain , L , Andreani , L C & Galli , M 2011 , ' Room-temperature emission at telecom wavelengths from silicon photonic crystal nanocavities ' , Applied Physics Letters , vol. 98 , no. 20 , 201106 . https://doi.org/10.1063/1.3591174
Applied Physics Letters
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