Circular dichroism mode splitting and bounds to its enhancement with cavity-plasmon-polaritons

Baranov, Denis G.; Munkhbat, Battulga; Länk, Nils Odebo; Verre, Ruggero; Käll, Mikael; Shegai, Timur

doi:10.1515/nanoph-2019-0372

Cited by 36 publications

(27 citation statements)

References 36 publications

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“…Furthermore, by controlling the nanoparticles density, which is straightforward using the electron beam lithography, our system allows creating a vacuum energy gradient in the lateral direction. Lastly, the nanoparticles can be made chiral [31], opening the opportunities to create chiral vacuum states with various vacuum energies depending on the handedness of the chiral meta-atom.…”

Section: Discussionmentioning

confidence: 99%

Ultrastrong coupling between nanoparticle plasmons and cavity photons at ambient conditions

et al. 2020

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Ultrastrong coupling is a distinct regime of electromagnetic interaction that enables a rich variety of intriguing physical phenomena. Traditionally, this regime has been reached by coupling intersubband transitions of multiple quantum wells, superconducting artificial atoms, or two-dimensional electron gases to microcavity resonators. However, employing these platforms requires demanding experimental conditions such as cryogenic temperatures, strong magnetic fields, and high vacuum. Here, we use a plasmonic nanorod array positioned at the antinode of a resonant optical Fabry-Pérot microcavity to reach the ultrastrong coupling (USC) regime at ambient conditions and without the use of magnetic fields. From optical measurements we extract the value of the interaction strength over the transition energy as high as g/ω ~ 0.55, deep in the USC regime, while the nanorod array occupies only ∼4% of the cavity volume. Moreover, by comparing the resonant energies of the coupled and uncoupled systems, we indirectly observe up to ∼10% modification of the ground-state energy, which is a hallmark of USC. Our results suggest that plasmon-microcavity polaritons are a promising platform for room-temperature USC realizations in the optical and infrared ranges, and may lead to the long-sought direct visualization of the vacuum energy modification.

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Section: Discussionmentioning

confidence: 99%

Ultrastrong coupling between nanoparticle plasmons and cavity photons at ambient conditions

et al. 2020

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“…We previously explained the sign and origin of the differential transmission of LCP and RCP of individual crescents using a point‐dipole approximation to analyze the magneto‐electric polarizability. [ 28,48,49 ] In this model, the chiral response results from simultaneous excitation of electric and magnetic dipole moments that couple with different efficiency to incident LCP and RCP polarized electromagnetic waves. [ 50,51 ]…”

Section: Figurementioning

confidence: 99%

Chiral Surface Lattice Resonances

et al. 2020

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resonances. [5,6] A collective excitation (SLR) possesses a reduced linewidth as compared to the excitation of the LSPRs in nanoparticle ensembles. [1][2][3][4] Thus, SLRs can provide high quality-factor metasurfaces with substantial impact in nanophotonic and sensing applications. [1][2][3][4] Oblique incidence on planar metasurfaces constructed of an array of split-ring resonators showed that SLRs can also selectively respond to the handedness of circularly polarized light, causing sharp lattice-mode assisted extrinsic circular dichroism. [7,8] The spectral position of these SLRs can be tuned by the angle of incidence, leading to the emergence of extrinsic chiral surface lattice resonances. [9][10][11][12] Strong optical activity can also result from plasmonic 3D nanostructures without mirror symmetry. However, SLRs from arrays of 3D building-blocks with intrinsic chirality remain unexplored, but promise decreased losses and enhanced optical activity. [1,13] The fabrication of chiral 3D nanostructures is challenging for both, bottom-up and top-down methods. [14][15][16] Recently, the excitation of SLRs was seen in self-assembled, large area colloidal systems. [17,18] Such systems offer the possibility for fast manufacturing and covering large-areas on different substrate materials. [19] Colloid-based materials allow for embedding of nanoparticle arrays into flexible free-standing polymer films, [20] enabling the design of mechanically tunable [21] and stimuliresponsive hydrogel membranes. [22] Here, we use colloidal lithography [23][24][25] to fabricate arrays of 3D crescents with a selective response to the handedness of incident circularly polarized light, and we experimentally demonstrate handedness-dependent (chiral) SLRs at normal incidence. Colloidal lithography [23][24][25] is an experimentally simple and fast process to fabricate 3D chiral plasmonic nanostructures. [26][27][28] However, a necessary condition to observe SLRs in such nanostructure arrays is that their lattice constant must be in the range of the wavelength of the LSPRs of the individual nanostructures. [1][2][3][4] For objects with resonances in the near-infrared, such as, for example, split ring resonators, this requires large interparticle distances approaching the micrometer range. For conventional colloidal lithography processes, which depend on the controlled shrinkage of a polymer particle matrix, such distances are not easily achievable. [12,[28][29][30] Therefore, we use core-shell particles with rigid cores (silica) and soft, deformable polymer shells. [31,32] The particles selfassemble into hexagonally ordered monolayers at the air/water Collective excitation of periodic arrays of metallic nanoparticles by coupling localized surface plasmon resonances to grazing diffraction orders leads to surface lattice resonances with narrow line width. These resonances may find numerous applications in optical sensing and information processing. Here, a new degree of freedom of surface lattice resonances is experimentally investigated by dem...

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“…Next we show that this simple model gives surprising new insights in Salisbury screens for perfect absorption [3,[17][18][19][20][21][22][23][24][25][26], as well as in the problem of strong coupling of microcavity modes with metasurface resonances [34][35][36][37][38]. Finally, we discuss the application of our modeling approach to strong coupling of metasurface etalons with excitonic media [47,53].…”

Section: Introductionmentioning

confidence: 93%

A simple transfer-matrix model for metasurface multilayer systems

Berkhout

Koenderink

2020

Nanophotonics

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AbstractIn this work we present a simple transfer-matrix based modeling tool for arbitrarily layered stacks of resonant plasmonic metasurfaces interspersed with dielectric and metallic multilayers. We present the application of this model by analyzing three seminal problems in nanophotonics. These are the scenario of perfect absorption in plasmonic Salisbury screens, strong coupling of microcavity resonances with the resonance of plasmon nano-antenna metasurfaces, and the hybridization of cavities, excitons and metasurface resonances.

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Circular dichroism mode splitting and bounds to its enhancement with cavity-plasmon-polaritons

Cited by 36 publications

References 36 publications

Ultrastrong coupling between nanoparticle plasmons and cavity photons at ambient conditions

Ultrastrong coupling between nanoparticle plasmons and cavity photons at ambient conditions

Chiral Surface Lattice Resonances

A simple transfer-matrix model for metasurface multilayer systems

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