Stamp Transferred Suspended Graphene Mechanical Resonators for Radio Frequency Electrical Readout

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• 作者：Xuefeng Song ; Mika Oksanen ; Mika A. Sillanp盲盲 ; H. G. Craighead ; J. M. Parpia ; Pertti J. Hakonen
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：January 11, 2012
• 年：2012
• 卷：12
• 期：1
• 页码：198-202
• 全文大小：317K
• 年卷期：v.12,no.1(January 11, 2012)
• ISSN：1530-6992

文摘

We present a simple micromanipulation technique to transfer suspended graphene flakes onto any substrate and to assemble them with small localized gates into mechanical resonators. The mechanical motion of the graphene is detected using an electrical, radio frequency (RF) reflection readout scheme where the time-varying graphene capacitor reflects a RF carrier at f = 5鈥? GHz producing modulation sidebands at f 卤 f_m. A mechanical resonance frequency up to f_m = 178 MHz is demonstrated. We find both hardening/softening Duffing effects on different samples and obtain a critical amplitude of 40 pm for the onset of nonlinearity in graphene mechanical resonators. Measurements of the quality factor of the mechanical resonance as a function of dc bias voltage V_dc indicates that dissipation due to motion-induced displacement currents in graphene electrode is important at high frequencies and large V_dc.

Keywords:

Graphene; mechanical resonator; NEMS; Duffing oscillator; cavity read-out