1. Emission Engineering in Germanium Nanoresonators
- Author
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Lamberto Duò, Xiaofei Wu, Michele Celebrano, Milena Baselli, Marco Finazzi, Giovanni Isella, Roman Sordan, Fabio Pezzoli, Bert Hecht, Andrea Farina, Monica Bollani, Daniel Chrastina, Alberto Tosi, Andrea Bahgat Shehata, Johann Osmond, Paolo Biagioni, Adriano Della Frera, Jacopo Frigerio, Celebrano, M, Baselli, M, Bollani, M, Frigerio, J, Bahgat Shehata, A, Della Frera, A, Tosi, A, Farina, A, Pezzoli, F, Osmond, J, Wu, X, Hecht, B, Sordan, R, Chrastina, D, Isella, G, Duò, L, Finazzi, M, and Biagioni, P
- Subjects
waveguide resonators ,Atomic and Molecular Physics, and Optic ,Materials science ,Physics::Optics ,chemistry.chemical_element ,Germanium ,Purcell effect ,germanium emitter ,Waveguide (optics) ,Resonator ,Optics ,optical antenna ,Spontaneous emission ,Electrical and Electronic Engineering ,FIS/03 - FISICA DELLA MATERIA ,Silicon photonics ,silicon photonics ,business.industry ,Electronic, Optical and Magnetic Material ,optical antennas ,waveguide resonator ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Wavelength ,chemistry ,Optoelectronics ,Light emission ,business ,silicon photonic ,Biotechnology - Abstract
We experimentally investigate the smallest germanium waveguide cavity resonators on silicon that can be designed to work around 1.55 mu m 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.
- Published
- 2014