Broadband control of the optical properties of semiconductors through site-controlled self-assembly of microcrystals.
Opt Express
; 28(17): 24981-24990, 2020 Aug 17.
Article
in En
| MEDLINE
| ID: mdl-32907029
ABSTRACT
We investigate light-matter interactions in periodic silicon microcrystals fabricated combining top-down and bottom-up strategies. The morphology of the microcrystals, their periodic arrangement, and their high refractive index allow the exploration of photonic effects in microstructured architectures. We observe a notable decrease in reflectivity above the silicon bandgap from the ultraviolet to the near-infrared. Finite-difference time-domain simulations show that this phenomenon is accompanied by a â¼2-fold absorption enhancement with respect to a flat sample. Finally, we demonstrate that ordered silicon microstructures enable a fine tuning of the light absorption by changing experimentally accessible knobs as pattern and growth parameters. This work will facilitate the implementation of optoelectronic devices based on high-density microcrystals arrays with optimized light-matter interactions.
Full text:
1
Database:
MEDLINE
Language:
En
Year:
2020
Type:
Article