Self-consistent optical constants of SiO_2 and Ta_2O_5 films

Marcos, Luís Rodríguez de; Larruquert, Juan I.; Méndez, José A.; Aznárez, José A.

doi:10.1364/ome.6.003622

Cited by 227 publications

(116 citation statements)

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“…The optical constants of MgF 2 , LaF 3 , and CeF 3 films were calculated through an iterative double KK analysis. The present procedure reproduces the scheme followed in a research performed to obtain the optical constants of SiO 2 and Ta 2 O 5 films [35]. The process was iterated twice for each material until a self-consistent set {n,k} was obtained that best fitted all ellipsometry and photometry measurements.…”

Section: Optical Constants Calculation Proceduresmentioning

confidence: 95%

Self-consistent optical constants of MgF_2, LaF_3, and CeF_3 films

Marcos¹,

Larruquert²,

Méndez³

et al. 2017

Opt. Mater. Express

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Various fluorides are materials in nature that extend their transparency range to the shortest wavelengths in the far ultraviolet (FUV, 100nm<λ<200 nm). These are relevant materials to prepare multilayer coatings in the FUV for demanding applications such as space instrumentation for astrophysics, solar physics and atmosphere physics, as well as free electron lasers, plasma diagnostics, synchrotron radiation, lithography, spectroscopy, etc. Multilayer design requires the optical constants of the coating materials. Multilayers optimally alternate two transparent materials with contrasting refractive indices. The optical constants of a low-index material, MgF 2 , and of two high-index materials, LaF 3 and CeF 3 , have been determined in a wide spectral range and are presented here. Thin films of MgF 2 , LaF 3 , and CeF 3 were deposited by boat evaporation onto substrates at 523 K. Transmittance, reflectance, and ellipsometry measurements were performed in ranges jointly covering the 30-950-nm spectral range. This range was extended with literature data and extrapolations to obtain self-consistent optical constants using the Kramers-Kronig (KK) analysis. An iterative, double KK analysis procedure (successive reflectance-phase and k-n KK analyses) was carried out to obtain a self-consistent set of optical constants per material. With the final data sets, the experimental measurements were satisfactorily reproduced. Global self-consistency of the data sets was successfully evaluated through sum rules; additionally, local selfconsistency at each photon energy range was also evaluated through a novel sum-rule method which involves window functions. The new sets of optical constant extend the data availability mainly to the FUV and beyond, particularly for CeF 3 , where few data had been reported.

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Section: Optical Constants Calculation Proceduresmentioning

confidence: 95%

Self-consistent optical constants of MgF_2, LaF_3, and CeF_3 films

Marcos¹,

Larruquert²,

Méndez³

et al. 2017

Opt. Mater. Express

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“…1) it turns out that dispersion of high-Q TP-like states (two modes with lowest energies), that can efficiently interact with exciton, lies far from the exciton energy in this cavity design. By using S-quantization formalism [9] the modal Purcell factor dependence on the emission energy and the angle was calculated (Fig. 4).…”

Section: Resultsmentioning

confidence: 99%

“…The thickness of the CBP can be varied for mode spectral position tuning. Refractive indexes of the silicon oxide and tantalum pentoxide were taken from [9]. Optical parameters of the CBP came from experimental spectra fitting.…”

Section: Structure Descriptionmentioning

confidence: 99%

Hybrid Tamm Plasmon - Photonic Quasicrystal Cavity with an Organic Active Region

et al. 2019

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We theoretically investigate a hybrid Tamm plasmon cavity with a quasicrystal symmetry structure. The latter is replacing the usual distributed Bragg reflector with an organic (4,4-bis(N-carbazolyl)-1,1-biphenyl) active layer. The structure of considered model consists of a SiO2/Ta2O5 optical F7 Fibonacci system, an organic active layer, and a thin silver layer on the top. Evaluation of the modal Purcell factor for the hybrid structure demonstrates significant enhancement of the spontaneous emission rate for an emitter, which is coupled with the Tamm plasmonlike states.

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“…A simplified stBLM model included a water-rich tether, substrate-proximal and substrate-distal lipid monolayers, each assumed to be homogeneous within, and adjacent buffer. The thickness of individual layers matched the sputtering protocol and NR fits, and optical properties were determined from reference tables (40)(41)(42)(43). While the refractive indices and dispersion coefficients of the substrate differed for the two instruments, they were constant for the stBLMs within the validity of our assumptions.…”

Section: Quantitative Evaluation Of Spr Datamentioning

confidence: 97%

Association of Model Neurotransmitters with Lipid Bilayer Membranes

Loesche

Heinrich

Josey

et al. 2019

Preprint

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Aimed to reproduce the results of electrophysiological studies of synaptic signal transduction, conventional models of neurotransmission are based on the specific binding of neurotransmitters to ligand-gated receptor ion channels. However, the complex kinetic behavior observed in synaptic transmission cannot be reproduced in a standard kinetic model without the ad hoc postulation of additional conformational channel states. On the other hand, if one invokes unspecific neurotransmitter adsorption to the bilayer-a process not considered in the established models-the electrophysiological data can be rationalized with only the standard set of three conformational receptor states that also depend on this indirect coupling of neurotransmitters via their membrane interaction. Experimental verification has been difficult because binding affinities of neurotransmitters to the lipid bilayer are low. We quantify this interaction with surface plasmon resonance to measure equilibrium dissociation constants in neurotransmitter membrane association. Neutron reflectometry on artificial membranes reveals the structural aspects of neurotransmitters association with zwitterionic and anionic bilayers. We establish that serotonin interacts nonspecifically with the membrane at physiologically relevant concentrations whilst GABA (γaminobutyric acid) does not. Surface plasmon resonance shows that serotonin adsorbs with millimolar affinity and neutron reflectometry shows that it penetrates the membrane deeply whereas GABA is excluded from the bilayer. SignificanceReceptor ion channels in the postsynaptic membrane and their neurotransmitter agonists enable fast communication between neuronal cells. Electrophysiology studies reveal surprisingly complex kinetics that apparently require a variety of protein conformational states for their quantitative interpretation, but an alternate hypothesis invoking neurotransmitter membrane association reduces the complexity of the underlying reaction schemes significantly. While their affinity may be low, and is hard to quantify experimentally, neurotransmitter membrane association can be relevant because of their large temporary concentration in the synaptic cleft. With thermodynamic and structural measurements we quantify membrane-bound states of serotonin, establishing this neurotransmitter as membrane-affine, whereas the affinity of the more hydrophilic GABA is too low to register in our sensitivity-optimized measurement techniques.

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Self-consistent optical constants of SiO_2 and Ta_2O_5 films

Cited by 227 publications

References 50 publications

Self-consistent optical constants of MgF_2, LaF_3, and CeF_3 films

Self-consistent optical constants of MgF_2, LaF_3, and CeF_3 films

Hybrid Tamm Plasmon - Photonic Quasicrystal Cavity with an Organic Active Region

Association of Model Neurotransmitters with Lipid Bilayer Membranes

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