Brightening dark excitons with photoniccrystals TAMUEngineering NatureComms
The Fourier-optics-based spectroscopy has three operating modes: an imaging mode, an optical band-structure mode, and a spectra analysis mode. For the imaging mode, a broadband emission halogen lamp with a wavelength range of 400–2200 nm was used to provide white light. A CCD camera was placed at the image plane after the tube lens to show the image . For the optical band-structure mode, the back focal plane of an objective lens Nikon S Flour high NA objective, NA = 0.
Photoluminescence spectroscopy can be achieved by switching flip mirror to the laser mode. The sample was pumped by a wavelength-tunable mode-locked Ti: Sapphire laser and a cascade of OPO . A high numerical aperture 40Nikon S Flour high NA objective) was used to collect the PL signal at room temperature. The PL signal was then sent to the-plane imaging or the PL emission momentum distribution.
Numerical simulations of the angle-resolved reflection spectra mapping are carried out using the finite element method . We selected one unit cell as the simulation domain and use the periodic boundary condition in x and y directions and the periodic type of port to excite the horizontal magnetic field with various oblique incident angles for the input light. The S-parameter, S11, was used for the reflection spectra.
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