@article{1f717b9000534e1c9b6ba5b10683b57a,
title = "Upconversion amplification through dielectric superlensing modulation",
abstract = "Achieving efficient photon upconversion under low irradiance is not only a fundamental challenge but also central to numerous advanced applications spanning from photovoltaics to biophotonics. However, to date, almost all approaches for upconversion luminescence intensification require stringent controls over numerous factors such as composition and size of nanophosphors. Here, we report the utilization of dielectric microbeads to significantly enhance the photon upconversion processes in lanthanide-doped nanocrystals. By modulating the wavefront of both excitation and emission fields through dielectric superlensing effects, luminescence amplification up to 5 orders of magnitude can be achieved. This design delineates a general strategy to converge a low-power incident light beam into a photonic hotspot of high field intensity, while simultaneously enabling collimation of highly divergent emission for far-field accumulation. The dielectric superlensing-mediated strategy may provide a major step forward in facilitating photon upconversion processes toward practical applications in the fields of photobiology, energy conversion, and optogenetics.",
author = "Liangliang Liang and Teh, {Daniel B.L.} and Dinh, {Ngoc Duy} and Weiqiang Chen and Qiushui Chen and Yiming Wu and Srikanta Chowdhury and Akihiro Yamanaka and Sum, {Tze Chien} and Chen, {Chia Hung} and Thakor, {Nitish V.} and All, {Angelo H.} and Xiaogang Liu",
note = "Funding Information: This work is supported by the Singapore Ministry of Education (Grant R143000627112, R143000642112), Agency for Science, Technology and Research (A*STAR) (Grant R143000684305), National Research Foundation, Prime Minister{\textquoteright}s Office, Singapore under its Competitive Research Program (CRP Award No. NRF-CRP15-2015-03), National Basic Research Program of China (973 Program, Grant 2015CB932200), Japan Science and Technology Agency CREST (Grant JPMJCR1656), the CAS/SAFEA Inter- national Partnership Program for Creative Research Teams, and National Natural Science Foundation of China (21771135, 21471109). T.C.S. acknowledges the support from JSPS-NTU Joint Research Project M4082176, the Ministry of Education AcRF Tier 1 grant (RG173/16) and Tier 2 grants (MOE2015-T2-2-015 and MOE2016-T2-1-034), the Singapore National Research Foundation through the Competitive Research Programme (NRF-CRP14-2014-03), and the NRF Investigatorship Programme (NRF-NRFI-2018-04). Publisher Copyright: {\textcopyright} 2019, The Author(s).",
year = "2019",
month = dec,
day = "1",
doi = "10.1038/s41467-019-09345-0",
language = "English (US)",
volume = "10",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
number = "1",
}