1. Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
2. Center for Intelligent Sensors and MEMS (CISM), National University of Singapore, Singapore 117608, Singapore
3. Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore
4. NUS Suzhou Research Institute (NUSRI), Suzhou, Jiangsu 215123, China
5. NUS Graduate School’s Integrative Sciences and Engineering Programme (ISEP), National University of Singapore, Singapore 117583, Singapore