Supporting Information for Electronic and Vibrational Dynamics of Hollow Au Nanocages Embedded in Cu2O Shells Paul Szymanski 1, Mahmoud A. Mahmoud 1, Daniel O'Neil 1, Batyr Garlyyev 1, Mostafa A. El-Sayed*1, 2 1. Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive, Atlanta, GA 30332, USA,2. Adjunct professor, King Abdulaziz University, Jeddah, Saudi Arabia List of Animation Files Material Filename Description Au nanocage Movie01_Supp.avi Movie02_Supp.avi Movie03_Supp.avi Core–shell nanocage, 4 holes in shell Core–shell nanocage, 4 holes in shell, pores in cage capped with shell material Core–shell nanocage, 6 holes in shell Core–shell nanocage, 6 holes in shell, hollow space in cage filled with shell material Movie04_Supp.avi Eigenmode at 33.6 GHz, AVI file, M-JPEG codec Eigenmode at 34.3 GHz, AVI file, M-JPEG codec Time-dependent force simulation, AVI file, M-JPEG codec Eigenmode at 14.6 GHz, force acting on shell, AVI file, M-JPEG codec Eigenmode at 11.1 GHz, force acting on shell, AVI file, M-JPEG codec Movie05_Supp.avi Movie06_Supp.avi Movie07_Supp.avi Movie08_Supp.avi Movie09_Supp.avi Eigenmode at 15.9 GHz, force acting on shell, AVI file, M-JPEG codec Time-dependent force simulation, force acting on core, AVI file, M-JPEG codec Eigenmode at 16.6 GHz, force acting on shell, AVI file, M-JPEG codec Time-dependent force simulation, force acting on shell, AVI file, M-JPEG codec 1 Figure S1. Frequency-domain simulation results for the structural mechanics of AuNCs using the structure in Fig. 4a. Figure S2. Nearly-degenerate eigenmodes of AuNCs with frequency 30.32 GHz. The z-axis is oriented perpendicular to the page. 2 Figure S3. Nearly-degenerate eigenmodes of AuNCs with frequency 30.38 GHz. 3