**Author details**

Gopikrishna Madanan<sup>1</sup> \*† and Deepti Das Krishna2†

1 Department of Physics, Government Victoria College, Palakkad, Kerala, India

2 Department of Electronics, Cochin University of Science and Technology, Cochin, Kerala, India

\*Address all correspondence to: gopikrishna@gvc.ac.in

† These authors contributed equally.

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