TRENDS IN RESEARCH RELATED TO PHOTONIC CRYSTAL (PHC) FROM 2009 TO 2019: A BIBLIOMETRIC AND KNOWLEDGE MAPPING ANALYSIS

Photonic crystals (PhC) are a periodic structure of two different materials with a unique photonic bandgap that results in advantageous properties for wide applications. The utilization of PhC is spread to various fields and subjects, making it is hard to trace the progress and knowledge. Bibliometric studies have been done in this research to investigate the evolution of PhC-related research over the past decade (2009 - 2019) using the academic online search engine and databases Scopus (Elsevier). The VOSviewer tool was used to support the data analysis of these emerging fields. Scopus's screening process obtained one hundred seventy-five publications related to the PhC topic. Generally, the PhC topic in Scopus included the "Physics, Materials Science and Engineering" subjects. Keywords of finite difference time domain method, waveguide, and refractive index primarily used in the articles indicate the strong correlation. PhC research receives many contributions from countries and communities around the world. It also builds connections, especially for China as a leader in this research. Old developments have prepared photonic crystals for existing and new applications.