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. 2019 Oct 8;13(1):4–11. doi: 10.1007/s12200-019-0940-3

Exciton polaritons based on planar dielectric Si asymmetric nanogratings coupled with J-aggregated dyes film

Zhen Chai 1, Xiaoyong Hu 1,2,✉, Qihuang Gong 1,2
PMCID: PMC9733728  PMID: 36641583

Abstract

Optical cavity polaritons, originated from strong coupling between the excitons in materials and photons in the confined cavities field, have recently emerged as their applications in the high-speed lowpower polaritons devices, low-threshold lasing and so on. However, the traditional exciton polaritons based on metal plasmonic structures or Fabry-Perot cavities suffer from the disadvantages of large intrinsic losses or hard to integrate and nanofabricate. This greatly limits the applications of exciton poalritons. Thus, here we implement a compact low-loss dielectric photonic — organic nanostructure by placing a 2-nm-thick PVA doped with TDBC film on top of a planar Si asymmetric nanogratings to reveal the exciton polaritons modes. We find a distinct anti-crossing dispersion behavior appears with a 117.16 meV Rabi splitting when varying the period of Si nanogratings. Polaritons dispersion and mode anti-crossing behaviors are also observed when considering the independence of the height of Si, width of Si nanowire B, and distance between the two Si nanowires in one period. This work offers an opportunity to realize low-loss novel polaritons applications.

Keywords: exciton polaritons, dielectric Si asymmetric nanogratings, TDBC J-aggregated dyes film

Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grant No. 2018YFB2200403), the National Natural Science Foundation of China (Grant Nos. 61775003, 11734001, 11527901, and 11804008), the National Postdoctoral Program for Innovative Talents (No. BX201700011), and the China Postdoctoral Science Foundation (No. 2018M630019), and Beijing Municipal Science & Technology Commission (No. Z191100007219001).

Competing financial interests The authors declare that they have no competing financial interests.

Footnotes

Zhen Chai is a postdoctor of Prof. Qihuang Gong at Peking University. Now she majors in the study of the design of two-dimensional materials-nanostructures exciton polaritons and its application in optical devices.

Xiaoyong Hu is a Cheung Kong professor of physics at Peking University. Prof. Hu’s current research interests include photonic crystals, plasmonics, topological photonics and integrated photonic devices.

Qihuang Gong is a member of the Chinese Academy Sciences and Vice President at Peking University, China, where he is also the founding director of the Institute of Modern Optics. Prof. Gong’s current research interests are ultrafast optics, nonlinear optics, mesoscopic quantum optics and optical devices for applications.

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