Ultimate Limit for Optical Losses in Gold, Revealed by Quantitative Near-Field Microscopy

Lebsir, Yonas; Boroviks, Sergejs; Thomaschewski, Martin; Bozhevolnyi, Sergey I.; Zenin, Vladimir A.

doi:10.1021/acs.nanolett.2c01059

Cited by 16 publications

(15 citation statements)

References 42 publications

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“…It should be noted that the efficiency can be further increased by using high-refractive index metasurface ridges to boost their out-of-plane scattering and high-quality monocrystalline metal films to reduce the ohmic losses [34]. Thus, simply by changing the ridge material to titanium dioxide (TiO 2 ), the external quantum efficiency is expected to exceed 80%, even without further optimization of ridge parameters as described for the bullseye pattern [23].…”

Section: Discussionmentioning

confidence: 99%

Scattering holography designed metasurfaces for channeling single-photon emission

Komisar¹,

Kumar²,

Kan³

et al. 2023

Preprint

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Channelling single-photon emission in multiple well-defined directions and simultaneously controlling its polarization characteristics is highly desirable for numerous quantum technology applications. We show that this can be achieved by using quantum emitters (QEs) nonradiatively coupled to surface plasmon polaritons (SPPs), which are scattered into outgoing free-propagating waves by appropriately designed metasurfaces. The QE-coupled metasurface design is based on the scattering holography approach with radially diverging SPPs as reference waves. Using holographic metasurfaces fabricated around nanodiamonds with single Ge vacancy centers, we experimentally demonstrate on-chip integrated efficient generation of two well-collimated single-photon beams propagating along different 15 • off-normal directions with orthogonal linear polarizations.

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Section: Discussionmentioning

confidence: 99%

Scattering holography designed metasurfaces for channeling single-photon emission

Komisar¹,

Kumar²,

Kan³

et al. 2023

Preprint

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“…Highly linearity modulation response is realized by passive control of the relative phase in the nonidentical waveguides forming the interferometric arms. Optical transmission and scattering losses introduced by the isolating air gap have been characterized and can potentially be further reduced by using a high-quality (monocrystalline) Au platform for the plasmonic phase shifters 18 and by eventually interfacing the plasmonic waveguides with a low-loss photonic circuit. 24 As lithium niobate provides the critical material properties for practical deployment in electro-optic modulation applications, it remains the material-of-choice for telecommunication technology.…”

Section: ■ Discussionmentioning

confidence: 99%

Plasmonic Lithium Niobate Mach–Zehnder Modulators

et al. 2022

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Lithium niobate Mach−Zehnder modulators (MZMs) are present in a wide range of technologies and though fulfilling the performance and reliability requirements of present applications, they are becoming progressively too bulky, power inefficient, and slow in switching to keep pace with future technological demands. Here, we utilize plasmonics to demonstrate the most efficient (V π L = 0.23 Vcm) lithium niobate MZM to date, consisting of gold nanostripes on lithium niobate that guide both plasmonic modes and electrical signals that control their relative optical phase delay, thereby enabling efficient electro-optic modulation. For high linearity (modulation depth of >2 dB), the proposed MZM inherently operates near its quadrature point by shifting the relative phase of the signal in the interferometric arms. The demonstrated lithium niobate MZM manifests the benefits of employing plasmonics for applications that demand compact (<1 mm 2 ) and fast (>10 GHz) photonic components operating reliably at ambient temperatures.

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“…Precise knowledge of dielectric function is crucial, e.g., for understanding the electronic structure of metals, chemical bonding, and optical properties [16][17][18][19][20][21]. The dielectric function also determines many important parameters in plasmonics [22], such as surface plasmon propagation length, plasmon radiation rate, and nonradiative losses [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Light absorption by weakly rough metal surfaces

Gevorkian¹,

Petrosyan²,

Shahbazyan³

2022

Preprint

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We study light absorption by weakly rough metal surfaces with the roughness amplitude and correlation length smaller than the skin depth in metal. We develop a systematic perturbative approach for calculation of the absorptance in such systems and find that roughness-related absorptance variations are determined by an interplay between several system parameters which can result, in particular, in a greater absorption for smaller roughness amplitudes. We show that, for small-scale roughness, the absorptance variations are mainly caused by roughness-induced increase in effective volume of the surface layer, in which the incident light is predominantly absorbed. We argue that such absorptance fluctuations between different samples, even though not related to any electron scattering processes, can appear as sample-to-sample variations of the Drude scattering rate reported in recent measurements of the metal dielectric function.

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Ultimate Limit for Optical Losses in Gold, Revealed by Quantitative Near-Field Microscopy

Cited by 16 publications

References 42 publications

Scattering holography designed metasurfaces for channeling single-photon emission

Scattering holography designed metasurfaces for channeling single-photon emission

Plasmonic Lithium Niobate Mach–Zehnder Modulators

Light absorption by weakly rough metal surfaces

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