THz Ultrastrong Coupling in an Engineered Fabry–Perot Cavity

Mavrona, Elena; Rajabali, Shima; Appugliese, Felice; Andberger, Johan; Beck, Mattias; Scalari, Giacomo; Faist, Jérôme

doi:10.1021/acsphotonics.1c00717

Cited by 20 publications

(9 citation statements)

References 31 publications

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“…The mirrors establish symmetry, enabling the waves to travel within the cavity; in addition, because the mirrors have a modulus close to zero, the waves behave like standing ones. The Fabry–Perot cavity displays a high quality factor Q and a small modal volume V / V 0 , and for this reason, they play a decisive role in quantum electrodynamics investigation and light/matter interaction. − The high factor derives from a line width that is narrower than the vibrational frequency of the molecular species and imposes the crucial hierarchy in a resolved sideband regime where the mechanical frequency exceeds the optical line width as a fundamental condition . An important family of Fabry–Perot systems is constituted by the metal/dielectric/metal stack layer cavity, which is frequently used in cutting-edge plasmonics research.…”

Section: Introductionmentioning

confidence: 99%

Mapping the Optomechanical Coupling Mediated by Light among Mechanical Resonators Including Multilayer Cavity and Molecules

Simone

2022

ACS Appl. Opt. Mater.

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For a wide range of health applications, label-free sensing is essential, and microphotonics offers innovative technical solutions for pursuing important objectives. It has been shown that the strong light/matter coupling formed between a cavity and molecules through light excitation enhances biological and clinical applications by providing deep insights into molecular analysis. The multilayer cavity’s proposed architecture is meant to promote a robust interaction between light and matter. The top layer was made of silver Ag multishape features that, after being synthesized and characterized, were immobilized on the surface of a multilayer system. A layer of indium tin oxide (ITO) was flipped to produce two distinct layouts. An investigation of the mode behavior was conducted to describe the two layouts; experimental and numerical results point to a strong light/matter interaction by the ITO/SiO2/spacer/Ag design. For the characterization of light/matter coupling, a fluorophore was adsorbed on the surface; the anticrossing energy was then examined by integrating the experimental data with a three mechanical oscillator model. To show the system’s sensitivity, the analysis was carried out again using bovine serum albumin (BSA). The protein is water-soluble and exhibits an infrared absorption band (amide I), while also being active in the Raman region. In addition, it may consistently bind to Ag multishape features. The excellent sensitivity was demonstrated, enabling the use of image analysis to capture the surface-enhanced Raman scattering of BSA. In conclusion, the suggested sensing approach raises fresh possibilities for highly sensitive biomolecule detection method and encourages results when used as a fundamental sensing technique to investigate molecular patterns.

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Section: Introductionmentioning

confidence: 99%

Mapping the Optomechanical Coupling Mediated by Light among Mechanical Resonators Including Multilayer Cavity and Molecules

Simone

2022

ACS Appl. Opt. Mater.

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“…As an alternative route to control over material properties, light-matter coupling (LMC) in cavities has been suggested [53][54][55][56][57]. In these setups, instead of achieving strong modifications of material properties by strong driving, one focuses on realizing strong coupling (SC) between light and matter, supported by recent experimental advances [58][59][60][61][62][63][64][65][66]. This might enable the engineering of material properties already with few photons [67,68] or even inside a dark cavity, utilizing only the vacuum fluctuations of the light field [69].…”

Section: Introductionmentioning

confidence: 99%

Cavity engineering of Hubbard U via phonon polaritons

Dé¹,

Eckhardt²,

Kennes³

et al. 2022

J. Phys. Mater.

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Pump-probe experiments have suggested the possibility to control electronic correlations by driving infrared-active phonons with resonant midinfrared laser pulses. In this work we study two possible microscopic nonlinear electron-phonon interactions behind these observations, namely coupling of the squared lattice displacement either to the electronic density or to the double occupancy. We investigate whether photon-phonon coupling to quantized light in an optical cavity enables similar control over electronic correlations. We ﬁrst show that inside a dark cavity electronic interactions increase, ruling out the possibility that Tc in superconductors can be enhanced via eﬀectively decreased electron-electron repulsion through nonlinear electron-phonon coupling in a cavity. We further ﬁnd that upon driving the cavity, electronic interactions decrease. Two diﬀerent regimes emerge: (i) a strong coupling regime where the phonons show a delayed response at a time proportional to the inverse coupling strength, and (ii) an ultra-strong coupling regime where the response is immediate when driving the phonon polaritons resonantly. We further identify a distinctive feature in the electronic spectral function when electrons couple to phonon polaritons involving an infrared-active phonon mode, namely the splitting of the shake-oﬀ band into three bands. This could potentially be observed by angle-resolved photoemission spectroscopy.

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“…The effective volume can be markedly improved by introducing microcavity structures, such as Fabry–Perot (FP) interferometers. − In semiconductors, it has been adopted as an ideal cavity system to address the exciton polaritons in the visible and near-IR range. ,,, Besides, in the mid-IR range, an intersubband polariton has been introduced; for instance, mid-IR laser emission was observed through polariton-LO phonon scattering. , In particular, strong coupling of the vibrational modes with THz fields in FP microcavities has been demonstrated for α-lactose monohydrate, polar liquids, and carbonyl (PMMA) . To incorporate perovskite phonons into the microcavity, the thin perovskite film must be located at the center of the cavity, which can have strong field enhancement effects. , Conversely, the presence of supporting substrates disturbs the field distribution in the cavity and, hence, the light–matter coupling efficiency.…”

mentioning

confidence: 99%

Mechanical Control of Polaritonic States in Lead Halide Perovskite Phonons Strongly Coupled in THz Microcavity

Kim,

Khan,

Park

et al. 2023

J. Phys. Chem. Lett.

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We demonstrate the generation and control of polaritonic states in perovskite phonon polaritons, which are strongly coupled in the middle of a flexible Fabry−Perot cavity. We fabricated flexible perovskite films on a microporous substrate coated with graphene oxide, which led to a virtually free-standing film incorporated into the microcavity. Rabi splitting was observed when the cavity resonance was in tune with that of the phonons. The Rabi splitting energy increased as the film thickness increased, reaching 1.9 meV, which is 2.4-fold higher than the criterion for the strong coupling regime. We obtained dispersion curves for various perovskite film thicknesses exhibiting two polariton branches; clear beats between the two polaritonic branches were observed in the time domain. Flexible cavity devices with perovskite phonons enable macroscopic control over the polaritonic energy states through bending processes, which add an additional degree of freedom in the manipulation of polaritonic devices.

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THz Ultrastrong Coupling in an Engineered Fabry–Perot Cavity

Cited by 20 publications

References 31 publications

Mapping the Optomechanical Coupling Mediated by Light among Mechanical Resonators Including Multilayer Cavity and Molecules

Mapping the Optomechanical Coupling Mediated by Light among Mechanical Resonators Including Multilayer Cavity and Molecules

Cavity engineering of Hubbard U via phonon polaritons

Mechanical Control of Polaritonic States in Lead Halide Perovskite Phonons Strongly Coupled in THz Microcavity

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