1. Division of Theoretical Chemistry and Biology; Royal Institute of Technology; Roslagstullsbacken 15 S-10691 Stockholm Sweden
2. Department of Biomedical Engineering, Faculty of Engineering; National University of Singapore; 4 Engineering Drive 3 Singapore 117583
3. Tomsk State University; 36 Lenin Avenue Tomsk Russian Federation
4. Centre for Optical and Electromagnetic Research, Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics; South China Normal University; Guangzhou 510006 China