Journal articles: 'Near-resonant'

1

Rubin, L. F., and D. M. Swain. "Near-resonant holography." Optics Letters 16, no. 7 (April 1, 1991): 526. http://dx.doi.org/10.1364/ol.16.000526.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Lvov, Yuri V., Kurt L. Polzin, and Naoto Yokoyama. "Resonant and Near-Resonant Internal Wave Interactions." Journal of Physical Oceanography 42, no. 5 (May 1, 2012): 669–91. http://dx.doi.org/10.1175/2011jpo4129.1.

Full text

Abstract:

Abstract The spectral energy density of the internal waves in the open ocean is considered. The Garrett and Munk spectrum and the resonant kinetic equation are used as the main tools of the study. Evaluations of a resonant kinetic equation that suggest the slow time evolution of the Garrett and Munk spectrum is not in fact slow are reported. Instead, nonlinear transfers lead to evolution time scales that are smaller than one wave period at high vertical wavenumber. Such values of the transfer rates are inconsistent with the viewpoint expressed in papers by C. H. McComas and P. Müller, and by P. Müller et al., which regards the Garrett and Munk spectrum as an approximate stationary state of the resonant kinetic equation. It also puts the self-consistency of a resonant kinetic equation at a serious risk. The possible reasons for and resolutions of this paradox are explored. Inclusion of near-resonant interactions decreases the rate at which the spectrum evolves. Consequently, this inclusion shows a tendency of improving of self-consistency of the kinetic equation approach.

APA, Harvard, Vancouver, ISO, and other styles

3

Clark di Leoni, Patricio, and Pablo D. Mininni. "Quantifying resonant and near-resonant interactions in rotating turbulence." Journal of Fluid Mechanics 809 (November 18, 2016): 821–42. http://dx.doi.org/10.1017/jfm.2016.713.

Full text

Abstract:

Nonlinear triadic interactions are at the heart of our understanding of turbulence. In flows where waves are present, modes must not only be in a triad to interact, but their frequencies must also satisfy an extra condition: the interactions that dominate the energy transfer are expected to be resonant. We derive equations that allow direct measurement of the actual degree of resonance of each triad in a turbulent flow. We then apply the method to the case of rotating turbulence, where eddies coexist with inertial waves. We show that for a range of wavenumbers, resonant and near-resonant triads are dominant, the latter allowing a transfer of net energy towards two-dimensional modes that would be inaccessible otherwise. The results are in good agreement with approximations often done in theories of rotating turbulence, and with the mechanism of parametric instability proposed to explain the development of anisotropy in such flows. We also observe that, at least for the moderate Rossby numbers studied here, marginally near-resonant and non-resonant triads play a non-negligible role in the coupling of modes.

APA, Harvard, Vancouver, ISO, and other styles

4

Tai, Chen-yu, and Yet-ta Wu. "Triply resonant and near resonant wave mixing in I2 vapor." Optics Communications 58, no. 3 (June 1986): 217–22. http://dx.doi.org/10.1016/0030-4018(86)90193-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Huang, K. M., A. Z. Liu, S. D. Zhang, F. Yi, and Z. Li. "Spectral energy transfer of atmospheric gravity waves through sum and difference nonlinear interactions." Annales Geophysicae 30, no. 2 (February 3, 2012): 303–15. http://dx.doi.org/10.5194/angeo-30-303-2012.

Full text

Abstract:

Abstract. Nonlinear interactions of gravity waves are studied with a two-dimensional, fully nonlinear model. The energy exchanges among resonant and near-resonant triads are examined in order to understand the spectral energy transfer through interactions. The results show that in both resonant and near-resonant interactions, the energy exchange between two high frequency waves is strong, but the energy transfer from large to small vertical scale waves is rather weak. This suggests that the energy cascade toward large vertical wavenumbers through nonlinear interaction is inefficient, which is different from the rapid turbulence cascade. Because of considerable energy exchange, nonlinear interactions can effectively spread high frequency spectrum, and play a significant role in limiting wave amplitude growth and transferring energy into higher altitudes. In resonant interaction, the interacting waves obey the resonant matching conditions, and resonant excitation is reversible, while near-resonant excitation is not so. Although near-resonant interaction shows the complexity of match relation, numerical experiments show an interesting result that when sum and difference near-resonant interactions occur between high and low frequency waves, the wave vectors tend to approximately match in horizontal direction, and the frequency of the excited waves is also close to the matching value.

APA, Harvard, Vancouver, ISO, and other styles

6

Broer, Henk W., Sijbo J. Holtman, Gert Vegter, and Renato Vitolo. "Dynamics and geometry near resonant bifurcations." Regular and Chaotic Dynamics 16, no. 1-2 (October 13, 2010): 39–50. http://dx.doi.org/10.1134/s1560354710520023.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Tolstoy, I. "Resonant scatterer configurations near elastic boundaries." Journal of the Acoustical Society of America 78, S1 (November 1985): S58. http://dx.doi.org/10.1121/1.2022891.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Fontaine, Marcus, William Kalies, and Vincent Naudot. "Chaos near a resonant inclination-flip." Physica D: Nonlinear Phenomena 334 (November 2016): 141–57. http://dx.doi.org/10.1016/j.physd.2016.06.009.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Waterhouse, D. D. "Resonant sloshing near a critical depth." Journal of Fluid Mechanics 281 (December 25, 1994): 313–18. http://dx.doi.org/10.1017/s0022112094003125.

Full text

Abstract:

Oscillations of a tank at a near-resonant frequency have been shown to produce a response which changes from a ‘hard-spring’ to a ‘soft-spring’ response as the depth passes through a critical value. This paper investigates the transition region and it is shown, using a symbolic manipulator, that in fact the large-amplitude response is that of a soft spring on either side of this critical depth.

APA, Harvard, Vancouver, ISO, and other styles

10

King, Christopher, and Roger Waxler. "Resonant Decay Near an Accumulation Point." Reviews in Mathematical Physics 09, no. 02 (February 1997): 227–41. http://dx.doi.org/10.1142/s0129055x97000087.

Full text

Abstract:

We consider the quantum mechanics of a model system in which meta-stable states arise through perturbation of a sequence of embedded simple eigenvalues with an embedded accumulation point. It is shown that the embedded eigenvalues become resonances in the perturbed system. These resonances also accumulate, and the position of the accumulation point is unchanged. The positions of the resonances are estimated uniformly up to the accumulation point. The meta-stable states associated with these resonances have the usual approximately exponential decay with time. Some applications to physical models are discussed.

APA, Harvard, Vancouver, ISO, and other styles

11

Kobayashi, Toshihiro, and Riso Kato. "Near Resonant Raman Scattering in NaNO2." Journal of the Physical Society of Japan 54, no. 1 (January 15, 1985): 424–29. http://dx.doi.org/10.1143/jpsj.54.424.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

García-Calderón, Gastón, Roberto Romo, and Alberto Rubio. "Description of resonant tunneling near threshold." Physical Review B 50, no. 20 (November 15, 1994): 15142–47. http://dx.doi.org/10.1103/physrevb.50.15142.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Corbett, B., D. Zhu, B. Roycroft, P. Maaskant, M. Akhter, C. McAleese, M. J. Kappers, and C. J. Humphreys. "High brightness near-ultraviolet resonant LEDs." physica status solidi (c) 5, no. 6 (May 2008): 2056–58. http://dx.doi.org/10.1002/pssc.200778405.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Wang, Q. N., D. D. Nolte, and M. R. Melloch. "Hybrid resonant/near‐resonant photorefractive structure: InGaAs/GaAs multiple quantum wells." Journal of Applied Physics 74, no. 6 (September 15, 1993): 4254–56. http://dx.doi.org/10.1063/1.354438.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Sedgwick, J. B., P. R. Nelson, C. A. Jordan, L. E. Abbey, Y. Xu, and T. F. Moran. "Resonant and near-resonant charge transfer reactions of gaseous organic ions." Chemical Physics Letters 146, no. 1-2 (April 1988): 113–20. http://dx.doi.org/10.1016/0009-2614(88)85058-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Cavalieri, S., and M. Celli. "Far-wing light absorption induced by resonant or near-resonant collisions." Il Nuovo Cimento D 18, no. 9 (September 1996): 997–1003. http://dx.doi.org/10.1007/bf02457667.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Unnikrishnan, K. P., Jayan Thomas, V. P. N. Nampoori, and C. P. G. Vallabhan. "Nonlinear absorption in certain metal phthalocyanines at resonant and near resonant wavelengths." Optics Communications 217, no. 1-6 (March 2003): 269–74. http://dx.doi.org/10.1016/s0030-4018(03)01098-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Tsekhmistro, R. I., and N. N. Gorobets. "NEAR-FIELD EFFECTS OF RESONANT WIRE ANTENNAS." Telecommunications and Radio Engineering 69, no. 18 (2010): 1615–22. http://dx.doi.org/10.1615/telecomradeng.v69.i18.20.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Stipe, B. C., and C. Rettner. "Resonant Near-Field Optical Sources for TAR." IEEE Transactions on Magnetics 40, no. 4 (July 2004): 2546–48. http://dx.doi.org/10.1109/tmag.2004.828952.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Li, Guixin, Jensen Li, H. L. Tam, C. T. Chan, and K. W. Cheah. "Near field imaging with resonant cavity lens." Optics Express 18, no. 3 (January 21, 2010): 2325. http://dx.doi.org/10.1364/oe.18.002325.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Piilo, Jyrki. "Collision rates in near-resonant optical lattices." Journal of the Optical Society of America B 20, no. 5 (May 1, 2003): 1135. http://dx.doi.org/10.1364/josab.20.001135.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Bishop, A. I., B. N. Littleton, T. J. McIntyre, and H. Rubinsztein-Dunlop. "Near-resonant holographic interferometry of hypersonic flow." Shock Waves 11, no. 1 (March 2001): 23–29. http://dx.doi.org/10.1007/pl00004056.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Ponezha, E. A. "Decay of Intensity Correlation Function near Instability Point for the Model of Resonant Tunneling." Ukrainian Journal of Physics 61, no. 5 (May 2016): 440–48. http://dx.doi.org/10.15407/ujpe61.05.0440.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Li, Qiang, Zhonghong Shi, Lijun Wu, and Hong Wei. "Resonant scattering-enhanced photothermal microscopy." Nanoscale 12, no. 15 (2020): 8397–403. http://dx.doi.org/10.1039/c9nr10893a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Gaeta, G., and G. Pucacco. "Near-resonances and detuning in classical and quantum mechanics." Mathematics in Engineering 5, no. 1 (2022): 1–44. http://dx.doi.org/10.3934/mine.2023005.

Full text

Abstract:

<abstract><p>From the point of view of perturbation theory, (perturbations of) near-resonant systems are plagued by small denominators. These do not affect (perturbations of) fully resonant systems; so it is in many ways convenient to approximate near resonant systems as fully resonant ones, which correspond to considering the "detuning" as a perturbation itself. This approach has proven very fruitful in Classical Mechanics, but it is also standard in (perturbations of) Quantum Mechanical systems. Actually, its origin may be traced back (at least) to the Rayleigh-Ritz method for computing eigenvalues and eigenvectors of perturbed matrix problems. We will discuss relations between these approaches, and consider some case study models in the different contexts.</p></abstract>

APA, Harvard, Vancouver, ISO, and other styles

26

Mohammed, Abdelsalam, Yu-Ping Sun, Quan Miao, Hans Ågren, and Faris Gel'mukhanov. "Raman Scattering at Resonant or Near-Resonant Conditions: A Generalized Short-Time Approximation." Chinese Journal of Chemical Physics 25, no. 1 (February 2012): 31–47. http://dx.doi.org/10.1088/1674-0068/25/01/31-47.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

SESHADRI, S. R. "Anomalous absorption of the circularly polarized electromagnetic beams near the plasma frequency in a magnetized electron plasma." Journal of Plasma Physics 73, no. 3 (June 2007): 315–30. http://dx.doi.org/10.1017/s0022377806004697.

Full text

Abstract:

AbstractThe propagation of circularly polarized electromagnetic beams along the magnetostatic field in an electron plasma is investigated. As a consequence of a strong interaction with the medium, the beam spreads rapidly on propagation near the cutoff frequencies and the cyclotron resonant frequency of the corresponding plane waves, as well as near the plasma frequency. The power absorption for unit length near the cyclotron frequency and the plasma frequency are determined. For tightly focused beams, there is significant power absorption near the plasma frequency as compared with that at the cyclotron resonant frequency.

APA, Harvard, Vancouver, ISO, and other styles

28

Uberoi, C. "Resonant absorption of Alfven Waves and the Associated Phenomenon of Magnetic Reconnection." Symposium - International Astronomical Union 142 (1990): 245–49. http://dx.doi.org/10.1017/s007418090008801x.

Full text

Abstract:

The mathematical analysis of the Alfven Wave equation in inhomogeneous magnetic fields which explain the resonance absorption of Alfven surface waves near a resonant layer can also be used to show that magnetic reconnection process can arise near the zero frequency resonant layer driven by very low frequency Alfven surface waves. The associated phenomena of resonant absorption and magnetic reconnection in inhomogeneous plasmas can explain the recent obsrevations of intense magnetic activity in the long period geomagnetic micropulsations range, at magnetospheric cusp latitudes, during the time of occurence of flux transfer events.

APA, Harvard, Vancouver, ISO, and other styles

29

HAN HE-XIANG, WANG ZHAO-PING, LI GUO-HUA, JIANG DE-SHENG, and K. PLOOG. "NEAR RESONANT RAMAN SCATTERING FROM GaAs/AlAs SUPERLATTICES." Acta Physica Sinica 41, no. 4 (1992): 661. http://dx.doi.org/10.7498/aps.41.661.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Zhang, X. C., Y. Jin, K. Yang, and L. J. Schowalter. "Resonant nonlinear susceptibility near the GaAs band gap." Physical Review Letters 69, no. 15 (October 12, 1992): 2303–6. http://dx.doi.org/10.1103/physrevlett.69.2303.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

You, L., and M. Lewenstein. "Near-Resonant imaging of trapped cold atomic samples." Journal of Research of the National Institute of Standards and Technology 101, no. 4 (July 1996): 575. http://dx.doi.org/10.6028/jres.101.057.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Probst, B., R. Dubertrand, and S. Wimberger. "Fidelity of the near-resonant quantum kicked rotor." Journal of Physics A: Mathematical and Theoretical 44, no. 33 (July 27, 2011): 335101. http://dx.doi.org/10.1088/1751-8113/44/33/335101.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Siday, Thomas, Michele Natrella, Jiang Wu, Huiyun Liu, and Oleg Mitrofanov. "Resonant terahertz probes for near-field scattering microscopy." Optics Express 25, no. 22 (October 27, 2017): 27874. http://dx.doi.org/10.1364/oe.25.027874.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Kovaleva, A. S. "Near-resonant motions in systems with random perturbations." Journal of Applied Mathematics and Mechanics 62, no. 1 (January 1998): 43–49. http://dx.doi.org/10.1016/s0021-8928(98)00005-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Yan, Sen, and Guy A. E. Vandenbosch. "A FULLY PLANAR NEAR-FIELD RESONANT PARASITIC ANTENNA." Progress In Electromagnetics Research C 54 (2014): 163–69. http://dx.doi.org/10.2528/pierc14082803.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Scholten, R. E., T. J. O'Kane, T. R. Mackin, T. A. Hunt, and P. M. Farrell. "Calculating Trajectories for Atoms in Near-resonant Lightfields." Australian Journal of Physics 52, no. 3 (1999): 493. http://dx.doi.org/10.1071/ph99014.

Full text

Abstract:

We review several methods for calculating the time development of the internal state and the external motion of atoms in near-resonant light fields, with emphasis on studying the focussing of atomic beams into microscopic and potentially nanoscopic patterns. Three different approaches are considered: two-level semiclassical, multi-level semiclassical, and the Monte Carlo wavefunction method. The two-level semiclassical technique of McClelland and Scheinfein (1991) and McClelland (1995) is extended to three dimensions, and used to calculate the trajectories of atoms and the imaging properties of a simple lens formed from a near-resonant travelling TEM01 mode laser. The model is then extended to multi-level atoms, where we calculate the density matrix for the internal state of a sample of thermal atoms in a standing wave, and show how cooling processes can be simulated. Finally, we use the Monte Carlo wavefunction method to calculate the internal state of the atom, and compare the results and required computation time to those of the multi-level semiclassical technique.

APA, Harvard, Vancouver, ISO, and other styles

37

McIntyre, Timothy J., Alexis I. Bishop, Troy N. Eichmann, and Halina Rubinsztein-Dunlop. "Enhanced flow visualization with near-resonant holographic interferometry." Applied Optics 42, no. 22 (August 1, 2003): 4445. http://dx.doi.org/10.1364/ao.42.004445.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Williams, G. R. J. "Near-resonant contribution to the hyperpolarizability in benzoporphrins." Journal of Molecular Structure: THEOCHEM 283 (July 1993): 185–89. http://dx.doi.org/10.1016/0166-1280(93)87128-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Liu, Z., D. L. Xu, and S. J. Liao. "Finite amplitude steady-state wave groups with multiple near resonances in deep water." Journal of Fluid Mechanics 835 (November 27, 2017): 624–53. http://dx.doi.org/10.1017/jfm.2017.787.

Full text

Abstract:

In this paper, finite amplitude steady-state wave groups with multiple nearly resonant interactions in deep water are investigated theoretically. The nonlinear water wave equations are solved by the homotopy analysis method (HAM), which imposes no constraint on either the number or the amplitude of the wave components, to resolve the small-divisor problems caused by near resonances. A new kind of auxiliary linear operator in the framework of the HAM is proposed to transform the small divisors associated with the non-trivial nearly resonant components to singularities associated with the exactly resonant ones. Primary components, exactly resonant components together with nearly resonant components are considered as the initial non-trivial components, since all of them are homogeneous solutions to the auxiliary linear operator. For wave groups with weak nonlinearity, the energy transfer between nearby nearly resonant components is remarkable. As the nonlinearity increases, the number of steady-state wave groups increases as more components join the near resonance. This indicates that the probability of existence of steady-state resonant waves increases with the nonlinearity of wave groups. The frequency band broadens and spectral asymmetry becomes more and more pronounced. The amplitude of each component may either increase or decrease with the nonlinearity of wave groups, while the amplitude of the whole wave group increases continuously and finite amplitude wave groups are obtained. This work shows the wide existence of steady-state waves when multiple nearly resonant interactions are considered.

APA, Harvard, Vancouver, ISO, and other styles

40

Zhang, Lei, and Yao Wen Yang. "Modeling of Dynamic Characteristics of Ionic Polymer-Metal Composite Beam near Resonant Frequencies." Advanced Materials Research 79-82 (August 2009): 1305–8. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1305.

Full text

Abstract:

In this paper, the dynamic characteristic of an ionic polymer-metal composite (IPMC) cantilevered beam near resonant frequencies is investigated. A dynamic model is formulated on the basis of beam vibration, charge distribution and charge interactions. Experimental tests are conducted with an IPMC cantilevered beam actuated in frequency domain. Comparison with experimental results shows that the theoretical model is able to predict the dynamic responses of IPMC near resonant frequencies.

APA, Harvard, Vancouver, ISO, and other styles

41

Cai-Cheng Lu and Weng Cho Chew. "A near-resonance decoupling approach (NRDA) for scattering solution of near-resonant structures." IEEE Transactions on Antennas and Propagation 45, no. 12 (1997): 1857–62. http://dx.doi.org/10.1109/8.650205.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Lee, C. L., and N. C. Perkins. "Experimental Investigation of Isolated and Simultaneous Internal Resonances in Suspended Cables." Journal of Vibration and Acoustics 117, no. 4 (October 1, 1995): 385–91. http://dx.doi.org/10.1115/1.2874468.

Full text

Abstract:

The near resonant response of suspended elastic cables driven by harmonic, planar excitation is investigated experimentally. Measurements of large amplitude cable motions confirm previous theoretical predictions of fundamental classes of internally-resonant responses. For particular magnitudes of equilibrium curvature, strong modal interactions arise through isolated (two-mode) or simultaneous (three-mode) internal resonances. Four qualitatively different periodic responses are observed: (1) pure planar response, (2) 2:1 internally resonant nonplanar response, (3) 1:1 internally resonant nonplanar response, and (4) simultaneous, 2:2:1 internally resonant nonplanar response. Quasiperiodic responses are also observed.

APA, Harvard, Vancouver, ISO, and other styles

43

Prikazchikov, D. A. "NEAR-RESONANT REGIMES OF A STEADY-STATE MOVING LOAD ON A TRANSVERSELY ISOTROPIC ELASTIC HALF-PLANE." Izvestiya of Saratov University. New Series. Series: Mathematics. Mechanics. Informatics 15, no. 2 (June 2015): 215–21. http://dx.doi.org/10.18500/1816-9791-2015-15-2-215-221.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

KUMAR, G. V. PAVAN. "PLASMONIC PROPERTIES OF DIELECTRIC-CORE PLASMONIC-SHELL NANOCYLINDERS IN PASCAL TRIANGLE." International Journal of Nanoscience 11, no. 02 (April 2012): 1250017. http://dx.doi.org/10.1142/s0219581x12500172.

Full text

Abstract:

We report on the plasmonic properties of silver-coated dielectric nanocylinders arranged according to an unconventional geometrical representation called Pascal's triangle. We performed numerical simulations to calculate the extinction spectrum and identify the collective optical modes in the geometry. For resonant excitation at 410 nm, we found pronounced field localization (50 nm) at the center of the Pascal triangle. Further, we studied the near-field intensity as a function of experimentally-relevant variables such as excitation wavelength, angle of incidence and dielectric constant of the core material. Our analysis revealed pronounced difference between near-field intensities for resonant and non-resonant excitation wavelength at various angle of incident radiation; and an increment in near-field intensity at excitation wavelengths greater than 600 nm, with increase in dielectric constant of core material. Our study has relevance in development of substrates with tunable electromagnetic hot-spots for on-chip plasmonics.

APA, Harvard, Vancouver, ISO, and other styles

45

GUO, SHENG-LI, HUI-TIAN WANG, N. B. MING, JUN-YONG ZHANG, and ZHI-JIAN GUO. "INVESTIGATION OF NEAR TWO-PHOTON RESONANCE OPTICAL NONLINEARITIES IN Ni(Ac)2[N-(8-QUINOLYL) PYRIDINE-2-CARBOXAMIDE] · 4H2O BY THE Z-SCAN TECHNIQUE." Journal of Nonlinear Optical Physics & Materials 12, no. 01 (March 2003): 81–89. http://dx.doi.org/10.1142/s0218863503001225.

Full text

Abstract:

We describe a modified Z-scan technique for the case when nonlinear refraction is accompanied by nonlinear absorption to separately evaluate the nonlinear refraction and the nonlinear absorption by performing straightforward measurements with the aperture removed. We divide the closed aperture (S < 1) normalized Z-scan by a scan with an open aperture (S = 1). With nanosecond scale at a 532 nm wavelength, we first measured the nonlinear optical absorption and refraction coefficients of a solution of Ni(Ac)2[N-(8-quinolyl) pyridine-2-carboxamide] · 4H2O by using the modified Z-scan technique. The nonlinear absorption originates from the near resonant two-photon absorption while the mechanism of the nonlinear refraction is the near resonant two-photon absorption transition enhancement. The linear increasing dependences of the optical nonlinearities on the incident irradiance arise from the population redistribution due to the near resonant two-photon absorption.

APA, Harvard, Vancouver, ISO, and other styles

46

LEE, YOUNGSUK, and LESLIE M. SMITH. "On the formation of geophysical and planetary zonal flows by near-resonant wave interactions." Journal of Fluid Mechanics 576 (March 28, 2007): 405–24. http://dx.doi.org/10.1017/s0022112006004381.

Full text

Abstract:

Numerical simulations on a β-plane are used to further understand the formation of zonal flows from small-scale fluctuations. The dynamics of ‘reduced models’ are computed by restricting the nonlinear term to include a subset of triad interactions in Fourier space. Reduced models of near-resonant triads are considered, as well as the complement set of non-resonant triads. At moderately small values of the Rhines number, near-resonant triad interactions are shown to be responsible for the generation of large-scale zonal flows from small-scale random forcing. Without large-scale drag, both the full system and the reduced model of near resonances produce asymmetry between eastward and westward jets, in favour of stronger westward jets. When large-scale drag is included, the long-time asymmetry is reversed in the full system, with eastward jets that are thinner and stronger than westward jets. Then the reduced model of near resonances exhibits a weaker asymmetry, but there are nevertheless more eastward jets stronger than a threshold value.

APA, Harvard, Vancouver, ISO, and other styles

47

IBUKI, T., K. OKADA, K. KAMIMORI, J. SASAKI, H. YOSHIDA, A. HIRAYA, I. H. SUZUKI, et al. "RESONANT AUGER SPECTRA OF Kr NEAR THE L3 THRESHOLD." Surface Review and Letters 09, no. 01 (February 2002): 85–88. http://dx.doi.org/10.1142/s0218625x02001987.

Full text

Abstract:

Auger electron spectra were studied by scanning the photon energy near the L 3 threshold of krypton. Two resonant transitions were observed in the photon energy region 1673–1678 eV for the first time. They were identified to be the resonant 3d -2 5s and 3d -2 4d states originating in the 2p 3/2-1 5s and 2p 3/2-1 4d excitations, respectively.

APA, Harvard, Vancouver, ISO, and other styles

48

Buckup, T., J. Hauer, C. Serrat, and M. Motzkus. "Control of excited-state population and vibrational coherence with shaped-resonant and near-resonant excitation." Journal of Physics B: Atomic, Molecular and Optical Physics 41, no. 7 (March 26, 2008): 074024. http://dx.doi.org/10.1088/0953-4075/41/7/074024.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Marák, Károly, Tamás Pető, Sándor Bilicz, Szabolcs Gyimóthy, and József Pávó. "Bistatic RCS calculation for propellers at near-resonant frequencies." International Journal of Applied Electromagnetics and Mechanics 59, no. 1 (March 21, 2019): 19–26. http://dx.doi.org/10.3233/jae-171255.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Ali, Farhan, and Serap Aksu. "A Narrow-Band Multi-Resonant Metamaterial in Near-IR." Materials 13, no. 22 (November 14, 2020): 5140. http://dx.doi.org/10.3390/ma13225140.

Full text

Abstract:

We theoretically investigate a multi-resonant plasmonic metamaterial perfect absorber operating between 600 and 950 nm wavelengths. The presented device generates 100% absorption at two resonance wavelengths and delivers an ultra-narrow band (sub-20 nm) and high quality factor (Q=44) resonance. The studied perfect absorber is a metal–insulator–metal configuration where a thin MgF2 spacer is sandwiched between an optically thick gold layer and uniformly patterned gold circular nanodisc antennas. The localized and propagating nature of the plasmonic resonances are characterized and confirmed theoretically. The origin of the perfect absorption is investigated using the impedance matching and critical coupling phenomenon. We calculate the effective impedance of the perfect absorber and confirm the matching with the free space impedance. We also investigate the scattering properties of the top antenna layer and confirm the minimized reflection at resonance wavelengths by calculating the absorption and scattering cross sections. The excitation of plasmonic resonances boost the near-field intensity by three orders of magnitude which enhances the interaction between the metamaterial surface and the incident energy. The refractive index sensitivity of the perfect absorber could go as high as S=500 nm/RIU. The presented optical characteristics make the proposed narrow-band multi-resonant perfect absorber a favorable platform for biosensing and contrast agent based bioimaging.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Near-resonant'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles