We experimentally investigate the smallest germanium waveguide cavity resonators on silicon that can be designed to work around 1.55 μm wavelength and observe an almost 30-fold enhancement in the collected spontaneous emission per unit volume when compared to a continuous germanium film of the same thickness. The enhancement is due to an effective combination of (i) excitation enhancement at the pump wavelength, (ii) emission enhancement (Purcell effect) at the emission wavelength, and (iii) effective beaming by the nanoresonators, which act as optical antennas to enhance the radiation efficiency. Our results set a basis for the understanding and engineering of light emission based on subwavelength, CMOS-compatible nanostructures operating at telecommunication wavelengths.

Celebrano, M., Baselli, M., Bollani, M., Frigerio, J., Bahgat Shehata, A., Della Frera, A., et al. (2015). Emission engineering in germanium nanoresonators. ACS PHOTONICS, 2(1), 53-59 [10.1021/ph500432k].

Emission engineering in germanium nanoresonators

PEZZOLI, FABIO;
2015

Abstract

We experimentally investigate the smallest germanium waveguide cavity resonators on silicon that can be designed to work around 1.55 μm wavelength and observe an almost 30-fold enhancement in the collected spontaneous emission per unit volume when compared to a continuous germanium film of the same thickness. The enhancement is due to an effective combination of (i) excitation enhancement at the pump wavelength, (ii) emission enhancement (Purcell effect) at the emission wavelength, and (iii) effective beaming by the nanoresonators, which act as optical antennas to enhance the radiation efficiency. Our results set a basis for the understanding and engineering of light emission based on subwavelength, CMOS-compatible nanostructures operating at telecommunication wavelengths.
Articolo in rivista - Articolo scientifico
germanium emitter; optical antennas; silicon photonics; waveguide resonators;
germanium emitter; optical antennas; silicon photonics; waveguide resonators; Electronic, Optical and Magnetic Materials; Atomic and Molecular Physics, and Optics; Biotechnology; Electrical and Electronic Engineering
English
2015
2
1
53
59
partially_open
Celebrano, M., Baselli, M., Bollani, M., Frigerio, J., Bahgat Shehata, A., Della Frera, A., et al. (2015). Emission engineering in germanium nanoresonators. ACS PHOTONICS, 2(1), 53-59 [10.1021/ph500432k].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/87889
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