VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Tuesday 6
Poster Session

› 21:00 - 23:00 (2h)
Demonstration of sideband cooling and heating with thermal phonon in micromechanical system
Sung Wan Cho  1@  , Sung Un Cho  2@  , Myung Rae Cho  1@  , Yun Daniel Park  1, *@  
1 : Department of Physics & Astronomy Seoul National University  (SNU)
Department of Physics & Astronomy NS50 Seoul National University -  South Korea
2 : Korea Research Institute of Standards and Science  (KRISS)
267 Gajeong-ro, Yuseong-gu, Daejeon, 305-340 -  South Korea
* : Corresponding author

Recently, photonic and microwave cavity coupled to micro- and nano-mechanical system became important tool to control and manipulate motion of mechanical resonator and led to the realization of single phonon quanta. To enhance the dynamic coupling between photonic and mechanical system, there are many challenge in combining two distinct physical systems such as optical property matching and fabrication of nanostructure. To overcome these obstacles, we show that higher mode of thermal oscillation in the same mechanical resonator can act as embedded phononic cavity. Dielectric actuation generate strain-induced coupling between first and second thermal mode . Phonon cavity(2nd mode) is in the resolved sideband regime and which can assist cooling and heating of thermal oscillation in mechanical resonator. To realize phononic-cavity-embedded mechanical device, doubly-clamped micromechanical resonators are fabricated and dielectric field gradient by electrode can apply sideband pumping. Optical measurement of resonant response reveals its fundamental flexural mode of thermal motion at approximately 3.5 MHz (f1) and second mode (f2 : phononic cavity) at 7.1 MHz. With red-detuned and blue-detuned sideband pumping, we can observe both cooling and heating in 1st flexural mode of thermal oscillation.

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