Dimensions and refractive index estimates of deeply buried optical waveguides in Lithium Fluoride

Chiamenti, Ismael; Bonfigli, F.; Montereali, Rosa Maria; Kalinowski, Hypolito José

doi:10.1590/s2179-10742014000100004

Cited by 15 publications

(4 citation statements)

References 15 publications

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“…The wave in the photorefractive crystal (at x < 0) is determined by the solution to equation (7) in the case of β < √ n 2 P0 − µ 2 /k 2 0 , which is given by:…”

Section: Calculation Of the Field Distributionmentioning

confidence: 99%

“…The linearly graded, parabolic, exponential, Gaussian refractive index profiles, characterized by unique features [3,4], are often used in waveguide devices. The waveguide properties are studied with analytical [5] and numerical methods [6][7][8]. The analytical methods are divided into exact [9][10][11] and approximate (for example, Wentzel-Kramers-Brillouin (WKB), Stevenson-Pade) [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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The surface waves propagating along the contact between the layer with the constant gradient of refractive index and photorefractive crystal

Савотченко

2022

J. Opt.

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We consider the photorefractive crystal with diffusion nonlinearity mechanism contacting with the linearly graded-index medium. The new types of the surface waves propagating along the contact are found and their properties are described. The transition between two types of the surface waves can be controlled by the waveguide temperature. The light field penetrates into the photorefractive crystal much deeper than into the graded-index medium. The maxima intensity monotonically increase with an increase in the propagation constant, and monotonically decrease with an increase in the temperature. The localization length of the surface waves decreases with an increase in the characteristic distance the graded-index medium and with a decrease in the propagation constant and the temperature. The discrete spectrum of the propagation constant for the special waveguide mode corresponding to the case of exponential damping of intensity maxima of the surface waves with an increasing temperature is obtained. It is shown that the intensity maxima in the photorefractive crystal depend parabolic on the temperature at low temperature waveguide mode.

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“…The wave in the photorefractive crystal (at x < 0) is determined by the solution to equation (7) in the case of β < √ n 2 P0 − µ 2 /k 2 0 , which is given by:…”

Section: Calculation Of the Field Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The surface waves propagating along the contact between the layer with the constant gradient of refractive index and photorefractive crystal

Савотченко

2022

J. Opt.

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“…Adequate modifications in the parameters of the writing technique allowed the fabrication of Bragg waveguides in LiF crystals with femtosecond laser pulses. Several works focused on the study of the Bragg waveguide dimensions and the associated refractive index variations [25], the measurement of light propagation parameters in the range from 458 nm to 1550 nm [26]- [27] and the production of LiF crystal waveguide lasers [24], [33].…”

Section: Effects Of Birefringence On the Electromagnetic Guidance Of mentioning

confidence: 99%

Effects of Birefringence on the Electromagnetic Guidance of Structures Produced by Femtosecond Laser

Oliveira

Chiamenti

Fabris

et al. 2018

J. Microw. Optoelectron. Electromagn. Appl.

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Analysis of the state of polarization of light guided by structures recorded in lithium niobate and lithium fluoride crystals indicates that the recording method is determinant in the formation of birefringent structures. Each structure was written with a single and continuous translation of the crystal transversally to the laser beam. Birefringence was observed in the structures recorded in both crystals, despite the lack of intrinsic birefringence in lithium fluoride. The recorded structures are anisotropic showing regions with different birefringence. The structure generated with femtosecond laser is directly linked to the recording method and the crystalline lattice. This characteristic can be advantageous for application in photonic devices.

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“…Many technical applications in optics and electronics widely use media with inhomogeneous space distribution of refractive index called graded-index media [30][31][32][33][34]. In particular, such media are used in the development of optical waveguides and fibers [35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Surface waves propagating along the interface between a parabolic graded-index medium and a self-focusing nonlinear medium: exact analytical solution

Савотченко

2022

J. Opt.

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The waveguide properties of interface between a parabolic graded-index medium and a self-focusing nonlinear medium are described theoretically. The exact analytical solution to the wave equation with dielectric permittivity dependent on the distance from interface and on the electric field intensity is found. The obtained solution describes the new type of nonlinear surface wave. It is shown that the electric field is localized completely inside the parabolic graded-index layer. The dispersion equation determining explicit dependence of the effective refractive index on the thickness of the parabolic graded-index layer and the change in dielectric constant in it is found in a particular case corresponding to the exotic surface wave propagation. The influence of the optical parameters on the distribution profile of the electric field across is analyzed. The decrease in the field in surface waves with distance from the interface is non-exponential.

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Dimensions and refractive index estimates of deeply buried optical waveguides in Lithium Fluoride

Cited by 15 publications

References 15 publications

The surface waves propagating along the contact between the layer with the constant gradient of refractive index and photorefractive crystal

The surface waves propagating along the contact between the layer with the constant gradient of refractive index and photorefractive crystal

Effects of Birefringence on the Electromagnetic Guidance of Structures Produced by Femtosecond Laser

Surface waves propagating along the interface between a parabolic graded-index medium and a self-focusing nonlinear medium: exact analytical solution

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