David (Juyoung) is a PhD student in Applied Physics who joined the Atwater group in 2025. He is currently researching transmissive active metasurfaces and optomechanical nonlinearities. He graduated from Korea Advanced Institute of Science and Technology (KAIST) with a Bachelor's degree in Mechanical Engineering and Physics (Double major) and a Master's degree in Electrical Engineering. Outside of research, David enjoys swimming, cycling, running and music.