1 Department of Photonics Engineering, Technical University of Denmark2 Diode Lasers and LED Systems, Department of Photonics Engineering, Technical University of Denmark3 Technical University of Denmark4 Linköping University
An approach of fabricating pseudoperiodic antireflective subwavelength structures on silicon carbide by using self-assembled Au nanopatterns as etching mask is demonstrated. The nanopatterning process is more time-efficiency than the e-beam lithography or nanoimprint lithography process. The influences of the reactive-ion etching conditions and deposited Au film thickness to the subwavelength structure profile and its corresponding surface reflectance have been systematically investigated. Under the optimal experimental conditions, the average reflectance of the silicon carbide in the range of 390x02013;784 nm is dramatically suppressed from 21.0x00025; to 1.9x00025; after introducing the pseudoperiodic nanostructures. A luminescence enhancement of 226x00025; was achieved at an emission angle of 20x000B0; on the fluorescent silicon carbide. Meanwhile, the angle-resolved photoluminescence study presents a considerable omnidirectional luminescence enhancement.
Optical Materials Express, 2013, Vol 3, Issue 1, p. 86-94