Large enhancement of second harmonic generation in polymer films by microcavities

Cao, Hui; Hall, David B.; Torkelson, John M.; Cao, Chang-qi

doi:10.1063/1.125811

Cited by 40 publications

(40 citation statements)

References 15 publications

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“…In Refs. [15,18] the technique was extended to include the effects of second-and third-order nonlinearities of materials like GaP and GaAs, which have anisotropic χ (2) and χ (3) tensors. Therefore, the methods are quite general and can handle vector field propagation in two dimensions and time.…”

Section: Nonlinear Results For a Representative Lorentz-type Mediummentioning

confidence: 99%

“…Harmonic generation is examined also by quantifying and comparing the role that surface and volume terms play with respect to intrinsic second-and third-order nonlinear susceptibilities, i.e., χ (2) and χ (3) . This evaluation becomes necessary because near the ε ∼ 0 condition the longitudinal electric field may be enhanced from several hundreds to many thousands of times, resulting in strong nonlinear surface (quadrupole-like) and volume (magnetic dipole, electric quadrupole) sources, beyond the contributions of the intrinsic nonlinearities.…”

Section: Introductionmentioning

confidence: 99%

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Singularity-driven second- and third-harmonic generation atε-near-zero crossing points

et al. 2011

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We show an alternative path to efficient second-and third-harmonic generation in proximity of the zero crossing points of the dielectric permittivity in conjunction with low absorption. Under these circumstances, any material, either natural or artificial, will show similar degrees of field enhancement followed by strong harmonic generation, without resorting to any resonant mechanism. The results presented in this paper provide a general demonstration of the potential that the zero-crossing-point condition holds for nonlinear optical phenomena. We investigate a generic Lorentz medium and demonstrate that a singularity-driven enhancement of the electric field may be achieved even in extremely thin layers of material. We also discuss the role of nonlinear surface sources in a realistic scenario where a 20-nm layer of CaF 2 is excited at 21 μm, where ε ∼ 0. Finally, we show similar behavior in an artificial composite material that includes absorbing dyes in the visible range, provide a general tool for the improvement of harmonic generation using the ε ∼ 0 condition, and illustrate that this singularity-driven enhancement of the field lowers the thresholds for a plethora of nonlinear optical phenomena.

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Section: Nonlinear Results For a Representative Lorentz-type Mediummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Singularity-driven second- and third-harmonic generation atε-near-zero crossing points

et al. 2011

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“…The enhancement is ascribed to the combination of high electromagnetic mode density of states and a slowing down of the optical waves at frequency near the photonic band gap (PBG) [1] and PBG edge [4] and also is to introduce resonant cavities to achieve better field confinement and enhancement [9][10][11][12].…”

Section: Introductionmentioning

confidence: 98%

Giant enhancement of second harmonic generation in one-dimensional defective nonlinear photonic crystals

2014

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In this paper, the second harmonic generations in finite size one-dimensional defective nonlinear photonic crystals have been investigated. To calculate the conversion efficiency, fundamental and second harmonic wave propagation among four proposed structures, we use the transfer matrix method. In the designed defective nonlinear photonic crystal structures, the linear and nonlinear optical parameters are both periodically modulated and thus the second harmonic generation efficiency can be several orders of magnitude larger than in a conventional quasiphase-matched nonlinear structure with the same sample length.

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“…The fundamental optical field is strongly localized in the microcavity spacer if the wavelength of fundamental wave is in the resonance with MC mode. It brings about to the enhancement of nonlinear optical response that has been recently observed in photonic-crystal microcavities with polymer 10) , or semiconductor 11),12) spacers. Thus, the central idea of reviewed studies was to generalize specific approaches of the enhancement of nonlinear optical effects from dielectric photonic crystals to nonlinear magnetooptical effects in magnetophotonic crystals.…”

Section: )mentioning

confidence: 99%

Nonlinear Magneto-Optics in Magnetophotonic Crystals

2006

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In this review paper, the results of recent observation and studies of the nonlinear magneto-optical effects in magnetophotonic crystals (MPC) are surveyed. Key point of our interests in nonlinear optics of MPC is extension of nonlinear optical enhancement recently observed in dielectric photonic crystals (PC) to enhancement of intrinsically weak nonlinear magneto-optical effects. These PC mechanisms of strong increase of efficiency of nonlinear optical effects are related to optical field increase due to the light localization and parametric enhancement due to the phase-matching. Strong magnetization-induced intensity effect in second-harmonic (SHG) and third-harmonic (THG) generation is observed in magnetophotonic microcavities formed from single half-wave magnetic garnet layers, sandwiched between two nonmagnetic dielectric photonic mirrors. Absolute values of magnetization-dependent contributions to the SHG and THG intensity are strongly enhanced due to light localization in microcavity garnet spacer. Magnetization-induced intensity effects in SHG are observed in two types of MPC: one-dimensional multilayer MPC formed from pairs of alternating quarter-wavelength magnetic garnet and silicon oxide layers and three-dimensional MPC based on synthetic silica opals infiltrated by magnetic garnet. Parametric enhancement of MSHG intensity is due to phase-matching at the bend edge. Pure magnetic component of phase-matched SHG is enhanced by two orders of magnitude in garnet MPC in experimental geometry as nonmagnetic SHG is canceled. Apart from intensity effects, magnetic impact strongly influences other parameters of the SHG radiation in MPC. Significant magnetization-induced variations of phase and rotation of polarization of the SHG waves are observed and systematically studied in garnet multilayer MPC.

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Large enhancement of second harmonic generation in polymer films by microcavities

Cited by 40 publications

References 15 publications

Singularity-driven second- and third-harmonic generation atε-near-zero crossing points

Singularity-driven second- and third-harmonic generation atε-near-zero crossing points

Giant enhancement of second harmonic generation in one-dimensional defective nonlinear photonic crystals

Nonlinear Magneto-Optics in Magnetophotonic Crystals

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