Optical Router and 4 × 1 Multiplexer of Coexisting Crystal Field and Non‐Hermitian Autler‐Townes Splitting Controlled by Photon–Phonon Dressing in Eu 3+ : BiPO 4

Anas Mujahid, Huanrong Fan, Yafen Wang +7 more

Advanced Quantum TechnologiesSep 8, 20236 citations

Applied Physics A

Spectral control of nanodiamond using dressed photon–phonon etching

R. Nagumo, Felix Julian Brandenburg, Anna Ermakova, Fedor Jelezko, Takashi Yatsui

Published Aug 4, 2015• 5 citations

Publisher

DOI: 10.1007/s00339-015-9400-0

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Optical Router and 4 × 1 Multiplexer of Coexisting Crystal Field and Non‐Hermitian Autler‐Townes Splitting Controlled by Photon–Phonon Dressing in Eu 3+ : BiPO 4

Anas Mujahid, Huanrong Fan, Yafen Wang +7 more

Abstract For the first time, the Autler Townes‐splitting dependency on parity‐time symmetry breaking is investigated. The first‐, second‐, and third‐order splitting in spectral domain outputs obtained through different phase transitions of Eu 3+ : BiPO 4 are explored. First‐order splitting corresponds to pure crystal field splitting attributed to the shifting of energy levels and the inherent effect of the crystal field. Second/third‐order splitting results from the coexistence of crystal field and non‐Hermitian spectral Autler Townes (SAT)‐splitting caused by single‐photon dressing coupled with the interaction of phonon and double photon–phonon dressing. It is further explored the relationship between spectral and temporal‐domain splitting obtained through the different phases of Eu 3+ : BiPO 4 by changing the laser detuning. It is authenticated that the contributions of crystal field, photon, and phonon dressing interactions can only be individually distinguished in the spectral domain. Moreover, the experiment results suggest the analogy of an optical 4 × 1 multiplexer with a channel spacing contrast of ≈91% and an optical router with a channel equalization ratio of ≈93%.Abstract For the first time, the Autler Townes‐splitting dependency on parity‐time symmetry breaking is investigated. The first‐, second‐, and third‐order splitting in spectral domain outputs obtained through different phase transitions of Eu 3+ : BiPO 4 are explored. First‐order splitting corresponds to pure crystal field splitting attributed to the shifting of energy levels and the inherent effect of the crystal field. Second/third‐order splitting results from the coexistence of crystal field and non‐Hermitian spectral Autler Townes (SAT)‐splitting caused by single‐photon dressing coupled with the interaction of phonon and double photon–phonon dressing. It is further explored the relationship between spectral and temporal‐domain splitting obtained through the different phases of Eu 3+ : BiPO 4 by changing the laser detuning. It is authenticated that the contributions of crystal field, photon, and phonon dressing interactions can only be individually distinguished in the spectral domain. Moreover, the experiment results suggest the analogy of an optical 4 × 1 multiplexer with a channel spacing contrast of ≈91% and an optical router with a channel equalization ratio of ≈93%.

Advanced Quantum TechnologiesSep 8, 20236 citations

{g}^{(2)}(0)>45

in the cathodoluminescence of nanodiamond nitrogen vacancy (

{\mathrm{NV}}^{0}

) centers excited by a converged electron beam in an aberration-corrected scanning transmission electron microscope. Plasmon-mediated

{\mathrm{NV}}^{0}

cathodoluminescence exhibits a 16-fold increase in luminescence intensity correlated with a threefold reduction in photon bunching compared with that of uncoupled

{\mathrm{NV}}^{0}

centers. This effect is ascribed to the excitation of single temporally uncorrelated

{\mathrm{NV}}^{0}

centers by single surface plasmon polaritons. Spectrally resolved Hanbury Brown--Twiss interferometry is employed to demonstrate that the bunching is mediated by the

{\mathrm{NV}}^{0}

phonon sidebands, while no observable bunching is detected at the zero-phonon line. The data are consistent with fast phonon-mediated recombination dynamics, a conclusion substantiated by agreement between Bayesian regression and Monte Carlo models of superthermal

{\mathrm{NV}}^{0}

luminescence.