Optical properties of nonlinear potassium lithium niobate crystals

Wan, Youbao; Guo, Xuguang; Chen, Jing; Yuan, Xianzhang; Chu, Junhao; Li, Jing

doi:10.1016/s0022-0248(01)01781-x

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…At higher substrate temperatures, under vacuum conditions, or at very low oxygen ambient (0.2 Pa), there can be a possibility of desorption of oxygen from the film, resulting in the formation of vacancies and defects. It is reported that the structural and optical properties of KLN strongly depend on the Li content in the material 36, 37. Moreover, the incorporation of a volatile atom into the film at a given substrate temperature is greatly dependent on the reactive atmosphere 38.…”

Section: Resultsmentioning

confidence: 99%

Optical Response Sensitive to the Assembly in a Molecular Material: Ultrathin Film with a Vanishing Electronic Absorption

Khanna

Radhakrishnan

2009

Chemistry A European J

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Optical properties of single-component molecular materials can often be described in terms of modest perturbations on the responses of the molecular building blocks; in specific systems, the modifications may be more pronounced. In all cases, however, the effects are broadly independent of the form of assembly, such as thin films, nanostructures and crystals, even though variations may exist at the quantitative level. We present a very different situation encountered with an amphiphilic molecule possessing a strongly polar head group that shows similar electronic absorption spectra in the solution as well as the bulk solid state, but a dramatically different one in ultrathin Langmuir-Blodgett (LB) films. The lowest energy absorption is switched off completely in the latter. It is demonstrated further that a metastable form of the LB film exhibiting the normal molecular spectrum can be generated, although its lowest energy absorption decays and vanishes over a period of time. The Langmuir films formed at the air/water interface and the corresponding LB films are examined through pressure-area isotherms, microscopy and spectroscopy. The experimental observations coupled with models constructed through computational investigations allowed us to interpret the unusual optical responses, which are a result of the specific supramolecular 2D assembly in the LB film and the impact of the neighboring molecular dipoles on the intramolecular charge transfer transition. The present study illustrates that selective molecular design and directed assembly can be exploited to elicit dramatic changes in physical responses of molecular materials and realize novel effects in molecular nanostructures.

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Section: Resultsmentioning

confidence: 99%

Optical Response Sensitive to the Assembly in a Molecular Material: Ultrathin Film with a Vanishing Electronic Absorption

Khanna

Radhakrishnan

2009

Chemistry A European J

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“…ν1, ν2 and ν3 are all stretch vibration modes, ν4, ν5 and ν6 are all bend vibration modes. Thus, there should be three strong characteristic Raman peaks and two characteristic infrared reflection bands belonging to the internal vibration modes of the [NbO6] 7-octahedron [16].…”

Section: Raman Characterizationmentioning

confidence: 99%

“…The third mode (ν5) is split into the 86/108/137 cm -1 peaks due to the deviation from the Oh symmetry and distortion of the octahedron for every B1 and B2 site [16]. The peaks between 162 and 539 cm -1 belong to the external vibration modes for [NbO6] 7-and are presumably attributed to the Li ions occupying C sites which causes polar lattice vibrations [16]. From x=0.19, ν5 mode corresponds to a single broad peak at 108-110 cm -1 .…”

Section: Undoped Klnmentioning

confidence: 99%

“…For x>0.23, all peaks tend to disappear between 325 and 600 cm -1 , the ν2 mode moves towards the red domain of frequencies and the ν1 mode moves abruptly towards the blue range. The splitting of ν5 mode and the complicated external modes in the wavelength range from 160 to 540 cm -1 shows the striking influence of Li ions in C sites on the vibrations of [NbO6] 7-when x increases [16]. Figures 6 and 7 give the evolution of respectively the full width at half maximum (FWHM) of the ν2 mode and its frequency with the composition expressed as x.…”

Section: Undoped Klnmentioning

confidence: 99%

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Growth by µ-PD and LHPG and Characterization by Raman Spectroscopy of Potassium Lithium Niobate (KLN) Single-Crystal Fibers

Kozhaya

Ferriol

Cochez

et al. 2009

XXXV JEEP – 35th Conference on Phase Equilibria

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“…Potassium lithium niobate (KLN) solid solutions with tetragonal tungsten-bronze structure have been shown to be potentially a suitable material for non-linear optical applications [10][11][12]. Up to now, KLN single crystals [10][11][12][13], ceramics [14,15] or films [16] have been obtained.…”

Section: Introductionmentioning

confidence: 99%

Structure and crystallization behavior of mixed potassium-lithium niobiosilicate glasses

Aronne

Fanelli

Califano

et al. 2008

Journal of Non-Crystalline Solids

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Optical properties of nonlinear potassium lithium niobate crystals

Cited by 10 publications

References 10 publications

Optical Response Sensitive to the Assembly in a Molecular Material: Ultrathin Film with a Vanishing Electronic Absorption

Optical Response Sensitive to the Assembly in a Molecular Material: Ultrathin Film with a Vanishing Electronic Absorption

Growth by µ-PD and LHPG and Characterization by Raman Spectroscopy of Potassium Lithium Niobate (KLN) Single-Crystal Fibers

Structure and crystallization behavior of mixed potassium-lithium niobiosilicate glasses

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