CAJ | 학술논문

对于静电驱动的亚微米及纳米尺度的谐振器,衍射效应将会使其驱动及振动频率的光学检测变得更加困难,为克服衍射效应的影响,设计、制作了新型纳机电谐振梁——H型梁,使其产生高频振荡.并制作了双端固支谐振器以进行比较.2种谐振梁的最小宽度和厚度分别为180和200nm.对这2种结构的机械振动特性进行了实验研究.谐振器的基波振荡频率在6.8～20MHz之间,远低于理论预估值.通过模拟仿真发现,过腐蚀是导致振动频率低于理论值的重要原因之一.实验还发现:2种谐振器的谐振频率之差随着梁的长度增加而下降；在室温下减小样品腔的压强后,谐振器的品质因数可以大大提高.
대우정전구동적아미미급납미척도적해진기,연사효응장회사기구동급진동빈솔적광학검측변득경가곤난,위극복연사효응적영향,설계、제작료신형납궤전해진량——H형량,사기산생고빈진탕.병제작료쌍단고지해진기이진행비교.2충해진량적최소관도화후도분별위180화200nm.대저2충결구적궤계진동특성진행료실험연구.해진기적기파진탕빈솔재6.8～20MHz지간,원저우이론예고치.통과모의방진발현,과부식시도치진동빈솔저우이론치적중요원인지일.실험환발현:2충해진기적해진빈솔지차수착량적장도증가이하강；재실온하감소양품강적압강후,해진기적품질인수가이대대제고.
Diffraction effects will bring about more difficulties in actuating resonators,which are electrostatically actuated ones with sub-micrometer or nanometer dimensions,and in detecting the frequency of the resonator by optical detection.To　avoid　the　effects　of　diffraction, a　new　type　of nanoelectromechanical　systems　(NEMS)　resonators　is fabricated and actuated to oscillate. As a comparison, a doubly clamped silicon beam is also fabricated and studied.The smallest width and thickness of the resonators are 180 and 200 nm,respectively.The mechanical oscillation responses of these two kinds of resonators are studied experimentally.Results show that the resonant frequencies are from 6.8 to 20MHz,much lower than the theoretical values.Based on the simulation,it is found that over-etching is one of the important factors which results in lower frequencies than the theoretical values.It is also found that the difference between resonance frequencies of two types of resonators decreases with the increase in beam length.The quality factor is improved greatly by lowering the pressure in the sample chamber at room temperature.