Phase shift effects in Fabry-Perot interferometry

Koester, Charles J.

doi:10.6028/jres.064a.020

Cited by 9 publications

(3 citation statements)

References 27 publications

(49 reference statements)

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“…Because the properties of the coatings change with wavelength (Koestler 1960;Lichten 1985), the difference between the interference order at 5007 À and 4861 À has some uncertainty which leaves an error of a few km s" 1 in the zero-point of the radial velocities. The barycenter of the emission line is found with an accuracy better than one sampling step of the interferometer (7.5 km s -1 ); the effective accuracy in relative velocity for the high S/N profiles is of the order of ± 1 km s -1 .…”

Section: Introductionmentioning

confidence: 99%

Superbubble blowout in the giant H II region NGC 2363?

Roy¹,

Joncas

Boulesteix

et al. 1991

ApJ

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The velocity field of the giant H n complex NGC 2363 in the SBm galaxy NGC 2366 has been mapped in the [O in] À 5007 Â line using a scanning Fabry-Perot interferometer. The [O m] line profiles correspond to symmetrical and single component profiles in most of the nebulae of NGC 2366, except in the bright core of the giant H n NGC 2363 where strong splitting of the [O m] line occurs. This splitting is consistent with a bubble 200 pc in diameter expanding with a velocity of 45 km s-1. The total kinetic energy of the bubble is 2 x 10 52 ergs; the kinematic age of the bubble is less than or equal to 2 x 10 6 yr. The bubble could be produced by the sole action of combined stellar winds from the central clusters of OB stars. A well-defined sector, 150 pc wide, of the H n complex originating at the bubble shows systematic receding velocities; it is suggested that this region acts as a vent through which gas escapes into the halo of the galaxy. Large Ha shells are observed in the surroundings of NGC 2363. There is also evidence for a very broad and low-intensity [O m] high-velocity (~1000 km s-1) component associated with the bubble. Subject headings: galaxies: individual (NGC 2366)-nebulae: H n regionsnebulae : individual (NGC 2363)-nebulae : internal motions 141

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Section: Introductionmentioning

confidence: 99%

Superbubble blowout in the giant H II region NGC 2363?

Roy¹,

Joncas

Boulesteix

et al. 1991

ApJ

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“…With w the size of the nanocube, m an integer, and Φ a term that accounts for the phase accumulated by the wave as it travels back and forth in the cavity. Based on Fresnel's reflection coefficients, Φ can be derived as follows:

Φ = δ ​ / ​ k_{0}, δ = \arg (\frac{n_{normalout} - n_{normaleff}}{n_{normalout} + n_{normaleff}})

where n out is the refractive index of the surrounding material; in our case, refractive index of the SAM is often reported between 1.45 and 1.5 . Again, Equation has to be solved numerically.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Reproducibility and Nonlocal Effects in Film‐Coupled Nanoantennas

Reynaud

Duché

Rouzo

et al. 2018

Advanced Optical Materials

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has led to significant works on antireflecting coatings [1] or enhanced absorption in thin film photovoltaics. [2] The second is surface plasmon polariton (SPP). SPP describes both an excitation of surface charges and the propagation of an EM field confined at a metal-dielectric interface. This feature can be tuned either by designing an appropriate stack of refractive indices above the metal surface, or by structuring it to produce a grating whose periodicity will control which wavevectors are able to propagate at the interface. Both of these methods were successfully implemented for surface enhanced Raman spectroscopy [3] or increased absorption in organic solar cells. [4] However, one of the drawbacks of surface modification is the cost that comes from the use of processes such as e-beam lithography or milling, or the low yield obtained by certain specific structures with nanometric gaps between metal tips. [5] More recently, a hybrid concept has arisen. Instead of using the LSP coming from nanoparticles embedded into a bulk, or the SPP that appears on a textured metal surface, colloidal nanoparticles are directly deposited upon a metal film. Because they are synthetized and kept in liquid phase, these nanoparticles need to be individually protected by a thin (a few nanometers) shell of surfactant -often polymers, such as polyvinylpyrrolidone (PVP) -to prevent aggregation. Once deposited on a film, this dielectric shell acts as a spacer that creates a metalinsulator-metal (MIM) nanocavity between the particle and the substrate. This design has been shown to couple gap plasmon modes at frequencies related to the width of the particle, the thickness of the gap, and the material used. [6,7] This bottom-up method has two main advantages: i) it is a low-cost technique compared with other e-beam lithography or milling processes and ii) it can create nanometric gaps that are very challenging to design at comparable yield with other approaches. Despite these advantages, it is still difficult to control the thickness of the dielectric spacer with a high degree of accuracy. Indeed, the thickness of the gap is only tuned by washing the colloidal nanoparticles to reduce the amount of PVP that covers them, up to the approximate desired thickness. Since a nanometric difference in cavity thickness results in a resonance shift of about a hundred nanometers, it is crucial to improve control on the cavity geometry if we aim to address specific spectral ranges. In the case of PVP-spaced nanopatch antennas there is furthermore a limit to gaps thicker than 3 nm because of the residual Nanopatch antennas based on the assembly of nanocubes are an appealing way to easily produce structures that feature very thin gaps between metals at a very low cost compared with other surface modification techniques. If these coatings are very good absorbers in the visible and near-infrared range, they can also be of interest for reaching light confinement regimes where nonlocality arises strongly, or for designing molecular electronics junctions e...

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“…The energy transmittance of a Fabry-Perot interferometer is given by the familiar Airy formula [ 5 ],

with

ρ and τ denote energy reflectance and transmittance of either interferometer plate, and OPD is the optical path difference between two successive beams, which at normal incidence is

where n is the refractive index of the spacing medium, t its geometrical thickness, and Δ t the change in path due to phase change upon reflection from one of the interferometer plates. By convention [ 6 ], the calculated value for the phase change represents an increase in optical path of

μ being an integer. Thus,

…”

Section: Statistical Tolerancesmentioning

confidence: 99%

Tolerances for layer thicknesses in dielectric multilayer coatings and interference filters

Mielenz¹

1960

J. RES. NATL. BUR. STAN. SECT. A.

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A th eory is d eveloped for di electric multilay cr coati ngs in which t he layers d epart from calculated thickncss. The t heory is a ppli ed t o alternating syst ems of quarter wa ve layer of ZnS a nd MgF2• The cffects of thickness errors arc : (1) A s hift of the wavelength at which maximum reflectance occur; and (2) a change in pha e shift upon refle ction. The m agn itud e of t hese effects, and also their dependence on various param eters, a re d et ermined. Statistical t ole ra nces for layer thickn esses a re computed for g iven tolerances on t he multilayer performancc. The accuracy required for p roducing di electric interference fi lters is u p to about '10 t imes h igher tha n t he a ccma cy s ufficient for the production of dielectri c mirrors and beam splitters. Various t echniqu es of experim e ntally controlli ng film thicknesses, and t heir acc uraci es, a rc discus cd . Th e production of mirrors a nd beam spli tters d eviatin g fr om t heoretical maximum refiecta nce by only 1 percent see ms to be possible with Dufour 's simple sin gle photocell method of monitoring film t hi ckn esses. \-Vith more precise me t hod s, suc h as those d evelop d by Giacomo a nd J acqu in ot, or T raub, t he p roduction of interference fi lters appears to be poss ible to wi thin plus or minu s one half their half widths.

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Phase shift effects in Fabry-Perot interferometry

Cited by 9 publications

References 27 publications

Superbubble blowout in the giant H II region NGC 2363?

Superbubble blowout in the giant H II region NGC 2363?

Enhancing Reproducibility and Nonlocal Effects in Film‐Coupled Nanoantennas

Tolerances for layer thicknesses in dielectric multilayer coatings and interference filters

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