Photonic crystals are materials with repeating internal structures that interact with light in unique ways. We can find natural examples in opals and the vibrant colored shells of some insects. Even though these crystals are made of transparent materials, they exhibit a "photonic bandgap" that blocks light at certain wavelengths and directions.
A special type of this effect is a "complete photonic bandgap," which blocks light from all directions. This complete bandgap allows for precise control of light, opening up possibilities for advancements in telecommunications, sensing, and quantum technologies. As a result, scientists have been working on different methods to create these advanced photonic crystals.
While 1D and 2D photonic crystals have been used in various applications, unlocking the secret to producing 3D photonic crystals with a complete photonic bandgap in the visible range has been fraught with challenges due to the need to achieve nanoscale precise control of all three dimensions in the fabrication process.
This is all set to change. In a study, "Printing of 3D photonic crystals in titania with complete bandgap across the visible spectrum" published in Nature Nanotechnology, researchers across institutions in Singapore and China have achieved an unprecedented feat. Led by Professor Joel Yang from the Singapore University of Technology and Design (SUTD), the team has developed a revolutionary method to print 3D photonic crystals using a customized titanium resin.
To read more, click here.