1 Supporting Information Helical-Structure-Dependent Surface-Enhanced Raman Spectroscopy Enhancement in Gold Nanohelices Jehyeok Ryu † , Seung-Hoon Lee † , Yuan-Han Lee ‡ , Yu-Hsu Chang,* , ‡ and Jae-Won Jang* ,† † Department of Physics, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of KOREA ‡ Department of Materials and Mineral Resources Engineering, Institute of Mineral Resources Engineering, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan R.O.C. *E-mail: (J.-W.J) jjang@pknu.ac.kr; jjang@pukyong.ac.kr (Y.-H.C) yhchang@ntut.edu.tw * J. Ryu and S.-H. Lee contributed equally to this work.