Inverse opals (IOs) have attracted attention over the past two decades due to their potential applications in bio, chemical and gas sensors, waveguides, low-threshold laser, light emitting diodes, solar cell, photo-catalysis, etc. They essentially have a periodic variation of refractive index with spacing of the order of optical wavelengths, producing thereby a forbidden/stop band which prohibits certain light frequencies to pass through. This feature is exploited to control the spontaneous emission of an embedded light emitter in PhCs by manipulating a parameter known as the local photonic density of state. Recent research focuses on complex photonic crystals like heterostructure which comprise of two PhCs with different periodic order lying one over the other and display two photonic stop bands with a passband in between. The undertaken work addresses the related issues and involves a unique way of controlling the emission properties of lanthanide ions (Tb3+ ions) in silica inverse opal photonic crystals and their heterostructures
Dr. Vishnu Prasad Shrivastava is working as a project scientist in physics department at Indian Institute of technology Kanpur. His research interest include Photonic band gap materials, nano-materials, lanthenides and meta-materials. He has done his PhD form materials science programme at IIT Kanpur in 2017. He did his M.Tech. in materials science and M.Sc. in Physics from Barkatullah University Bhopal.