| Affiliation: | 1. Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong SAR, 999077 P. R. China;2. Institute of Automation and Control Processes of the FEB RAS, 5 Radio St., Vladivostok, 690041 Russia;3. School of Physics and Engineering, ITMO University, Saint-Petersburg, 197101 Russia;4. Institute of Automation and Control Processes of the FEB RAS, 5 Radio St., Vladivostok, 690041 Russia
Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay Rd, Kowloon, Hong Kong SAR, 999077 P. R. China;5. CIC NanoGUNE BRTA, Avda Tolosa 76, Donostia-San Sebastian, 20018 Spain;6. Department of Physics, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077 P. R. China;7. Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay Rd, Kowloon, Hong Kong SAR, 999077 P. R. China |
| Abstract: | In order to advance the development of quantum emitter-based devices, it is essential to enhance light-matter interactions through coupling between semiconductor quantum dots with high quality factor resonators. Here, efficient tuning of the emission properties of HgTe quantum dots in the infrared spectral region is demonstrated by coupling them to a plasmonic metasurface that supports bound states in the continuum. The plasmonic metasurface, composed of an array of gold nanobumps, is fabricated using single-step direct laser printing, opening up new opportunities for creating exclusive 3D plasmonic nanostructures and advanced photonic devices in the infrared region. A 12-fold enhancement of the photoluminescence in the 900–1700 nm range is observed under optimal coupling conditions. By tuning the geometry of the plasmonic arrays, controllable shaping of the emission spectra is achieved, selectively enhancing specific wavelength ranges across the emission spectrum. The observed enhancement and shaping of the emission are attributed to the Purcell effect, as corroborated by systematic measurements of radiative lifetimes and optical simulations based on the numerical solution of Maxwell's equations. Moreover, coupling of the HgTe photoluminescence to high quality factor modes of the metasurface improves emission directivity, concentrating output within an ≈20° angle. |
