Optothermal nonlinearity of silica aerogel
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We report on the characterization of silica aerogel thermal optical nonlinearity, obtained by z-scan technique. The results show that typical Silica Aerogels have nonlinear optical coefficient similar to that of glass (≃ 10-12m2/W), with negligible optical nonlinear absorption. The nonlinear coefficient can be increased to values in the range of 10-10m2/W by embedding an absorbing dye in the Aerogel. This value is one order of magnitude higher than that observed in the pure dye and in typical highly nonlinear materials like liquid crystals.
Braidotti , M C , Gentilini , S , Fleming , A , Samuels , M C , Di Falco , A & Conti , C 2016 , ' Optothermal nonlinearity of silica aerogel ' Applied Physics Letters , vol 109 , no. 4 , 041104 . DOI: 10.1063/1.4959240
Applied Physics Letters
Copyright 2016 the Authors. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at http://apl.aip.org/
The authors acknowledge support from EPSRC (EP/J004200/1), the Templeton Foundation (grant number 58277) and the ERC project VANGUARD (grant number 664782).
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