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Open AccessFeature PaperArticle

Incandescent Light Bulbs Based on a Refractory Metasurface

1
Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
2
Photonics Center, Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
*
Author to whom correspondence should be addressed.
Invited paper.
Photonics 2019, 6(4), 105; https://doi.org/10.3390/photonics6040105
Received: 5 September 2019 / Revised: 4 October 2019 / Accepted: 9 October 2019 / Published: 12 October 2019
(This article belongs to the Special Issue Photonic Crystal Laser and Related Optical Devices)
A thermal radiation light source, such as an incandescent light bulb, is considered a legacy light source with low luminous efficacy. However, it is an ideal energy source converting light with high efficiency from electric power to radiative power. In this work, we evaluate a thermal radiation light source and propose a new type of filament using a refractory metasurface to fabricate an efficient light bulb. We demonstrate visible-light spectral control using a refractory metasurface made of tantalum with an optical microcavity inserted into an incandescent light bulb. We use a nanoimprint method to fabricate the filament that is suitable for mass production. A 1.8 times enhancement of thermal radiation intensity is observed from the microcavity filament compared to the flat filament. Then, we demonstrate the thermal radiation control of the metasurface using a refractory plasmonic cavity made of hafnium nitride. A single narrow resonant peak is observed at the designed wavelength as well as the suppression of thermal radiation in wide mid-IR range under the condition of constant surface temperature. View Full-Text
Keywords: incandescent light bulb; thermal radiation; refractory metal; microcavity; metamaterial; metasurface; surface plasmon; infrared emitter; nanoimprint incandescent light bulb; thermal radiation; refractory metal; microcavity; metamaterial; metasurface; surface plasmon; infrared emitter; nanoimprint
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MDPI and ACS Style

Toyoda, H.; Kimino, K.; Kawano, A.; Takahara, J. Incandescent Light Bulbs Based on a Refractory Metasurface. Photonics 2019, 6, 105.

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