One step towards a daily-use deep UV light source for sterilization and disinfection

IMAGE: Schematic of GaN monolithic microcavity Second-Harmonic Generation (SHG) gadget on a Si pedestal structure.
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Credit: Osaka University

Osaka, Japan – Researchers from the Graduate School of Engineering and the Center for Quantum Information and Quantum Biology at Osaka University revealed a brand-new strong state second-harmonic generation (SHG) gadget that transforms infrared radiation into blue light. This work might cause a useful daily-use deep ultraviolet light source for sterilization and disinfection.

Recently, deep ultraviolet (DUV) light sources have actually been bring in much attention in sterilization and disinfection. In order to recognize a bactericidal result while making sure user security, a wavelength variety of 220-230 nm is preferable. But DUV light sources in this wavelength variety that are both long lasting and extremely effective have actually not yet been established. Although wavelength conversion gadgets are appealing prospects, traditional ferroelectric wavelength conversion products cannot be used to DUV gadgets due to absorption edge.

Since nitride semiconductors such as gallium nitride and aluminum nitride have reasonably high optical nonlinearity, they can be used to wavelength conversion gadgets. Due to its openness to 210 nm, aluminum nitride is especially ideal for DUV wavelength conversion gadgets. However, understanding structures with occasionally inverted polarity like traditional ferroelectric wavelength conversion gadgets has actually shown rather tough.

The scientists proposed a unique monolithic microcavity wavelength conversion gadget without a polarity-inverted structure. A basic wave is boosted substantially in the microcavity with 2 dispersed Bragg reflectors (DBR), and counter-propagating 2nd harmonic waves are effectively given off in stage from the one side. As the very first step towards a useful DUV light source, a gallium nitride microcavity gadget was made by means of microfabrication technology, consisting of dry etching and anisotropic damp etching for vertical and smooth DBR sidewalls. By acquiring a blue SH wave, the efficiency of the proposed idea was effectively shown.

“Our device can be adapted to use a broader range of materials. They can be applied to deep ultraviolet light emission or even broadband photon pair generation,” senior author Masahiro Uemukai states. The scientists hope that due to the fact that this technique does not count on products or occasionally inverted structures, it will make future nonlinear optical gadgets much easier to build.


The short article, “Monolithic microcavity second harmonic generation device using low birefringence paraelectric material without polarity-inverted structure” was released in Applied Physics Express at DOI:

About Osaka University

Osaka University was established in 1931 as one of the 7 royal universities of Japan and is now among Japan’s leading detailed universities with a broad disciplinary spectrum. This strength is paired with a particular drive for development that extends throughout the clinical procedure, from basic research study to the production of used technology with favorable financial effects. Its dedication to development has actually been acknowledged in Japan and all over the world, being called Japan’s most ingenious university in 2015 (Reuters 2015 Top 100) and among the most ingenious organizations on the planet in 2017 (Innovative Universities and the Nature Index Innovation 2017). Now, Osaka University is leveraging its function as a Designated National University Corporation picked by the Ministry of Education, Culture, Sports, Science and Technology to add to development for human well-being, sustainable advancement of society, and social change.


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