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arXiv · 1011.3974

Optoelectronic cooling of mechanical modes in a semiconductor nanomembrane

K. Usami·A. Naesby·T. Bagci·B. Melholt Nielsen·J. Liu·S. Stobbe·P. Lodahl·E. S. Polzik
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Abstract

Optical cavity cooling of mechanical resonators has recently become a research frontier. The cooling has been realized with a metal-coated silicon microlever via photo-thermal force and subsequently with dielectric objects via radiation pressure. Here we report cavity cooling with a crystalline semiconductor membrane via a new mechanism, in which the cooling force arises from the interaction between the photo-induced electron-hole pairs and the mechanical modes through the deformation potential coupling. The optoelectronic mechanism is so efficient as to cool a mode down to 4 K from room temperature with just 50 uW of light and a cavity with a finesse of 10 consisting of a standard mirror and the sub-wavelength-thick semiconductor membrane itself. The laser-cooled narrow-band phonon bath realized with semiconductor mechanical resonators may open up a new avenue for photonics and spintronics devices.

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K. Usami, A. Naesby, T. Bagci, B. Melholt Nielsen, J. Liu, S. Stobbe, P. Lodahl, E. S. Polzik. 2010-11-22. Optoelectronic cooling of mechanical modes in a semiconductor nanomembrane. https://arxiv.org/abs/1011.3974

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