Wannier–Stark electro-optical effect, quasi-guided and photonic modes in 2D macroporous silicon structures with SiO2 coatings

• Published in: Applied surface science 2016-12, Vol.388, p.120-125
• Main Authors: Karachevtseva, L., Goltviansky, Yu, Sapelnikova, O., Lytvynenko, O., Stronska, O., Bo, Wang, Kartel, M.
• Format: Article
• Language: English
• Subjects: Coatings; Electric fields; Energy gaps (solid state); Macroporous silicon; Photonics; Quasi-guided and photonic modes; Silicon; Silicon dioxide; Surface chemistry; Two dimensional; Wannier–Stark effect
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2016.03.026

•The IR absorption spectra of oxidized macroporous silicon were studied.•The Wannier–Stark electro-optical effect on Si-SiO2 boundary was confirmed.•An additional electric field of quasi-guided optical modes was evaluated.•The photonic modes and band gaps were measured as peculiarities in absorption spectra. Opportunities to enhance the properties of structured surfaces were demonstrated on 2D macroporous silicon structures with SiO2 coatings. We investigated the IR light absorption oscillations in macroporous silicon structures with SiO2 coatings 0–800nm thick. The Wannier–Stark electro-optical effect due to strong electric field on Si-SiO2boundary and an additional electric field of quasi-guided optical modes were taken into account. The photonic modes and band gaps were also considered as peculiarities in absorbance spectra of macroporous silicon structures with a thick SiO2 coating. The photonic modes do not coincide with the quasi-guided modes in the silicon matrix and do not appear in absorption spectra of 2D macroporous silicon structures with surface nanocrystals.