Kalluru, HR and Basu, JK (2022) Selectively Strong Coupling of Mo S2 Excitons to a Metamaterial at Room Temperature. In: Physical Review Applied, 18 (1).
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Abstract
Light emitters in the vicinity of a hyperbolic metamaterial (HMM) show a range of quantum optical phenomena from spontaneous decay-rate enhancement to strong coupling. In this study, we integrate a monolayer molybdenum disulfide (MoS2) emitter in the near-field region of the HMM. The MoS2 monolayer has A and B excitons, which emit in the red region of the visible spectrum. We find that the B excitons couple to the HMM differently compared to A excitons. The fabricated HMM transforms to a hyperbolic dispersive medium at 2.14 eV, from an elliptical dispersive medium. The selective coupling of B excitons to the HMM modes is attributed to the inbuilt field gradient of the transition. The B exciton energy lies close to the transition point of the HMM, relative to the A exciton. So, the HMM modes couple more to the B excitons and the metamaterial functions as a selective coupler. The coupling strength calculations show that coupling is 2.5 times stronger for B excitons relative to A excitons. High near field of HMM, large magnitude, and the in-plane transition dipole moment of MoS2 excitons, result in strong coupling of B excitons and formation of hybrid light-matter states. The measured differential reflection and photoluminescence spectra indicate the presence of hybrid light-matter states, i.e., exciton polaritons. Rabi splitting of 143.5meV±14.4 meV at room temperature is observed. The low-Temperature photoluminescence measurement shows mode anticrossing, which is a characteristic feature of hybrid states. Our results show that the HMM works as an energy-selective coupler for multiexcitonic systems as MoS2.
| Item Type: | Journal Article |
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| Publication: | Physical Review Applied |
| Publisher: | American Physical Society |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Decay (organic); Excitons; Layered semiconductors; Molybdenum disulfide; Monolayers; Photoluminescence; Semiconductor quantum wells; Temperature, Dispersive media; Ellipticals; Light emitters; Light-matter state; Near field region; Optical phenomena; Rate enhancement; Spontaneous decay rates; Strong-coupling; Visible spectrums, Metamaterials |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 10 Aug 2022 05:51 |
| Last Modified: | 10 Aug 2022 05:51 |
| URI: | https://eprints.iisc.ac.in/id/eprint/75784 |
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