About the Authors

Kim Guan Saw

kgsaw@usm.my

Affiliation Nano-optoelectronics Research Laboratory, Universiti Sains Malaysia, Minden, Penang, Malaysia

Sau Siong Tneh

Affiliation Nano-optoelectronics Research Laboratory, Universiti Sains Malaysia, Minden, Penang, Malaysia

Gaik Leng Tan

Affiliation Nano-optoelectronics Research Laboratory, Universiti Sains Malaysia, Minden, Penang, Malaysia

Fong Kwong Yam

Affiliation Nano-optoelectronics Research Laboratory, Universiti Sains Malaysia, Minden, Penang, Malaysia

Sha Shiong Ng

Affiliation Nano-optoelectronics Research Laboratory, Universiti Sains Malaysia, Minden, Penang, Malaysia

Zainuriah Hassan

Affiliation Nano-optoelectronics Research Laboratory, Universiti Sains Malaysia, Minden, Penang, Malaysia

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KGS SST GLT. Performed the experiments: KGS SST GLT FKY SSN ZH. Analyzed the data: KGS SST GLT FKY SSN ZH. Contributed reagents/materials/analysis tools: KGS SST GLT FKY SSN ZH. Wrote the paper: KGS.