Probing interfaces and non-centrosymmetry using SHG: a short study guide

Martinez, Imee Su; Lee, Allen Marbert S.

VOLUME 17 NUMBER 1 (January to June 2024)

PSL%202021 vol14-no01-p12-28-Mikita%20and%20Padlan

SciEnggJ. 2024 17 (1) 104-129
available online: May 20, 2024
DOI: https://doi.org/10.54645/2024171TRN-31

*Corresponding author
Email Address: ismartinez@up.edu.ph
Date received: August 11, 2023
Date revised: December 5, 2023
Date accepted: January 12, 2024

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PERSPECTIVES AND PROSPECTIVES

Probing interfaces and non-centrosymmetry using SHG: a short study guide

Imee Su Martinez*^1,2 and Allen Marbert S. Lee²

¹Institute of Chemistry, University of the Philippines, Diliman,
Quezon City, Philippines, 1101
²Natural Sciences Research Institute, University of the Philippines,
Diliman, Quezon City, Philippines, 1101

KEYWORDS: SHG, NLO, interfaces, surfaces, chemistry

A primer for second harmonic generation (SHG) spectroscopy as a technique for interfacial analyses is presented in this paper. It includes a systematic discussion of the accompanying theoretical work involved in signal generation, which may serve as an introductory guide for students and researchers. Theoretical derivations of SHG intensity are also presented in this work, to elucidate introduced concepts. The very first working SHG microscope built in the Philippines, is also presented in this paper. In addition, interesting SHG studies on various interfaces through the years are described, including works on semiconductors, nanomaterials, lipid membranes, and biological samples.