Measurement of refractive index and dispersion of mica, employing multiple beam interference techniques

Bailey, A.I.; Kay, Susan M.

doi:10.1088/0508-3443/16/1/307

Cited by 32 publications

(19 citation statements)

References 1 publication

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“…3(b)). On the other hand, for the film C, the mode that is detected is not that of Brillouin nature in the mica substrate (a similar estimate shows that the Brillouin frequency is expected at f mica =2n mica V mica /λ=27 GHz, with n mica =1.6 [32]). The oscillatory components detected for film C actually correspond to mechanical resonance eigenmodes due to the confinement of acoustic phonons (R ac ∼0.17).…”

Section: Resultsmentioning

confidence: 81%

Ultrafast light-induced coherent optical and acoustic phonons in few quintuple layers of the topological insulatorBi2Te3

et al. 2015

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Ultrafast lattice dynamics of few quintuple layers of topological insulator (TI) Bi2Te3 is studied with time-resolved optical pump-probe spectroscopy. Both optical and acoustic phonons are photogenerated and detected. Here, in order to get new insights on the out-of-equilibrium electron-phonon coupling and phonons dynamics in confined TI, different nanostructures have been investigated (single or polycrystalline QLs assemblies and nano-crystallized islands). Contrary to previous literature claims, we show that even for nanostructures containing only 10 quintuple layers (QLs), the symmetric A1g(I) coherent optical phonon is efficiently photogenerated and no restriction due to the structural confinement appears. We also observe that whatever the arrangement of the nanostructures, the A1g(I) optical phonon features are similar (lifetime). We also report the observation of confined coherent acoustic phonons propagating from QLs to QLs whose spectrum is, this time, very sensitive to the atomic arrangement. In the case of the single crystalline ultrathin film, the time of flight analysis of these acoustic phonons provides direct estimate of the elastic properties of these nanostructures as well as some estimates of Van der Waals interactions between QLs.

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Section: Resultsmentioning

confidence: 81%

Ultrafast light-induced coherent optical and acoustic phonons in few quintuple layers of the topological insulatorBi2Te3

et al. 2015

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“…In addition, Schwenzfeier et al report a thickness reduction of the Ag layer of ∼20%, likely due to oxidation . The mica is birefringent with a reported birefringence of Δ n = 0.0035–0.0052, and we used 0.0035 for the fit . The mica thickness employed in the interferometric filter was measured independently using two mica sheets from the same crystal (and the same thickness).…”

Section: Resultsmentioning

confidence: 99%

Template-Stripped Ultra-Smooth Aluminum Films (0.2 nm RMS) for the Surface Forces Apparatus

et al. 2021

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We present a method for the fabrication of ultra-smooth (0.2 nm RMS), aluminum substrates through template stripping (TS). The method relies on the use of mica as a template in combination with thermal evaporation of Al at high (>10 nm/s) rates under vacuum (≤1 × 10–7 Torr). As a reactive metal, Al is usually not considered a viable option for TS off oxide templates. However, under these conditions, the adhesion between the Al film and mica is poor, enabling the removal of the template under water without any mica residue. We verify the absence of mica using atomic force microscopy, X-ray photoelectron spectroscopy, and contact angle measurements. We establish the suitability of these films for surface forces measurements. Multiple-bean interferometry in transmission yields high quality fringes allowing for the measurement of force–distance curves. The adhesion the films to mica is significantly higher than the adhesion of thermally evaporated Al (0.9 nm RMS). Preliminary results suggest that the TS-Al surface displays a higher corrosion resistance. The fabrication method will enable important experiments on this widely used material.

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“…The permittivity of Au was taken from standard tables in the literature, 31 and the mica substrate is described by constant values of the complex refractive index, n = 1.62, and κ = 0.075. 48 The spectrum of the near-field energy stored in the BE nanoresonator's central aperture volume is simulated by frequency sweeping between 280 THz and 380 THz (1.158 eV ∼ 1.572 eV) for a fixed value of amplitude (E 0x = 1 V/m) and phase of the incident wave. It is evaluated as ∫ V gap ε 0 |E x (ω, x, y, z)| 2 dV, where V gap is the volume of the central aperture, i.e., either the circular or the annular aperture.…”

Section: Methodsmentioning

confidence: 99%

“…We apply perfectly matched layers as the boundary condition of the calculations, and tetrahedral mesh elements are provided. The permittivity of Au was taken from standard tables in the literature, and the mica substrate is described by constant values of the complex refractive index, n = 1.62, and κ = 0.075 …”

Section: Methodsmentioning

confidence: 99%

Suppression of Radiative Damping and Enhancement of Second Harmonic Generation in Bull’s Eye Nanoresonators

Smirnov

Piao

et al. 2015

ACS Nano

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We report a drastic increase of the damping time of plasmonic eigenmodes in resonant bull's eye (BE) nanoresonators to more than 35 fs. This is achieved by tailoring the groove depth of the resonator and by coupling the confined plasmonic field in the aperture to an extended resonator mode such that spatial coherence is preserved over distances of more than 10 μm. Experimentally, this is demonstrated by probing the plasmon dynamics at the field level using broadband spectral interferometry. The nanoresonator allows us to efficiently concentrate the incident field inside the central aperture of the BE and to tailor its local optical nonlinearity by varying the aperture geometry. By replacing the central circular hole with an annular ring structure, we obtain 50-times higher second harmonic generation efficiency, allowing us to demonstrate the efficient concentration of long-lived plasmonic modes inside nanoapertures by interferometric frequency-resolved autocorrelation. Such a light concentration in a nanoresonator with high quality factor has high potential for sensing and coherent control of light-matter interactions on the nanoscale.

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Measurement of refractive index and dispersion of mica, employing multiple beam interference techniques

Cited by 32 publications

References 1 publication

Ultrafast light-induced coherent optical and acoustic phonons in few quintuple layers of the topological insulatorBi2Te3

Ultrafast light-induced coherent optical and acoustic phonons in few quintuple layers of the topological insulatorBi2Te3

Template-Stripped Ultra-Smooth Aluminum Films (0.2 nm RMS) for the Surface Forces Apparatus

Suppression of Radiative Damping and Enhancement of Second Harmonic Generation in Bull’s Eye Nanoresonators

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