Wang Shuang, Zheng Hai-Zi, Zhao Zhen-Ye, Lu Yue, Xu Chun-Hua. A pair of high resolution magnetic tweezers with illumination of total reflection evanescent field and its application in the study of DNA helicasesJ. Acta Physica Sinica, 2013, 62(16): 168703. DOI: 10.7498/aps.62.168703