|Inkjet-Printed Nanocavities on a Photonic Crystal Template|
Frederic S.F.Brossard,1* Vincenzo Pecunia,2,3* Andrew J.Ramsay1, Jonathan P.Griffiths2, Maxime Hugues4,5, and Henning Sirringhaus2
1Hitachi Cambridge Laboratory, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK.
2Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK.
3Institute of Functional Nano & Soft Materials(FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren’ai Road, Suzhou 215123 Jiangsu, P.R.China.
4Department of Electronic and Electrical Engineering, University of Sheffield, Mapping Street, Sheffield S1 3JD, UK.
5Universite Cote d’Azur, CRHEA-CNRS, Sophia Antipolis, Rue Bernard Gregory, 06560 Valbonne, France.
The last decade has witnessed the rapid development of inkjet printing as an attractive bottom-up microfabrication technology due to its simplicity and potentially low cost. The wealth of printable materials has been key to its widespread adoption in organic optoelectronics and biotechnology. However, its implementation in nanophotonics has so far been limited by the coarse resolution of conventional inkjet-printing methods. In addition, the low refractive index of organic materials prevents the use of “soft-photonics” in applications where strong light confinement is required. This study introduces a hybrid approach for creating and fine tuning high-Q nanocavities, involving the local deposition of an organic ink on the surface of an inorganic 2D photonic crystal template using a commercially available high-resolution inkjet printer. The controllability of this approach is demonstrated by tuning the resonance of the printed nanocavities by the number of printer passes and by the fabrication of photonic crystal molecules with controllable splitting. The versatility of this method is evidenced by the realization of nanocavities obtained by surface deposition on a blank photonic crystal. A new method for a free-form, high-density, material-independent, and high-throughput fabrication technique is thus established with a manifold ofopportunities in photonic applications.