The next-generation technology poised to revolutionize our society is 3D displays, and tunable nanophotonics is the key. Tunability in optical devices has been achieved in the past by many techniques including electrical doping, chemical doping, mechanical actuation, and optical nonlinearity. However, they all present either fast and small or slow and large tuning response. An unconventional material that can exhibit a large tuning with MHz response is 1T-tantalum disulfide. We observed unity order refractive index change in the visible at room temperature with an in-plane DC bias, AC bias, and moderately intense white light illumination (2.5 Suns). The strong correlations in this material give rise to charge ordering even at room temperatures and result in the large tunability. Using this new optical material, we demonstrate tunable meta-devices operating in the visible.
The next-generation technology poised to revolutionize our society is 3D displays, and tunable nanophotonics is the key. Tunability in optical devices has been achieved in the past by many techniques including electrical doping, chemical doping, mechanical actuation, and optical nonlinearity. However, they all present either fast and small or slow and large tuning response. An unconventional material that can exhibit a large tuning with MHz response is 1T-tantalum disulfide. We observed unity order refractive index change in the visible at room temperature with an in-plane DC bias, AC bias, and moderately intense white light illumination (2.5 Suns). The strong correlations in this material give rise to charge ordering even at room temperatures and result in the large tunability. Using this new optical material, we demonstrate tunable meta-devices operating in the visible.
The two next-generation technologies poised to revolutionize our society are 3D displays and efficient energy conversion, and nanophotonics is the key to both. While tunable devices enable 3D displays, LiDAR, virtual reality, and such other applications, refractory nanophotonic devices enable efficient thermophotovoltaic energy conversion. Both of these nanophotonic devices can be realized by exploiting the phenomenon of many-body effects. While electronic correlation leads to a huge optical tunability, parity-time symmetric interaction between photonic resonators results in frequency-selective thermal emitters necessary for efficient thermophotovoltaics. This talk will describe tunable nanophotonic devices based on charge density waves in 1T-tantalum disulfide and frequency-selective thermal emitters based on hybrid plasmonic-photonic resonators.
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