A dmit2- salt: [(C4H9)4N]Au(dmit)2 was synthesized. Its third-order nonlinear optical properties of its acetone solution
were investigated by Z-scan technique using a pulsed laser with 28 ps duration and 10 Hz repetition at 532 nm. The
third-order nonlinear refractive index n2 and nonlinear absorption coefficient β of the sample solution were obtained to
be about 4.997×10-12 esu and 1.818 cm/GW at the concentration of 2×10-3 M. The second-order hyperpolarizability for
its molecular was estimated to be as large as 2.74×10-31 esu, suggesting [(C4H9)4N]Au(dmit)2 is a promising material for
all-optical switching.
An organic material, 4,5-bis(benzoylthio)-1,3-dithiole-2-thione (BBDT), was synthesized. The thin film of BBDT doped
into poly(methyl methacrylate) (PMMA) was prepared using spin-coating method. Its linear optical properties were
characterized with prism coupler (SPA-4000, Korea). The third-order nonlinear optical (NLO) properties were
investigated using Z-scan technique with pulses of picoseconds at 532 nm. The Z-scan spectra reveal a strong nonlinear
absorption (reverse saturable absorption) and a positive nonlinear refraction. The nonlinear absorption coefficient is
calculated to be 1.302×10-9m/W. The nonlinear refractive index is 2.243×10-9esu. The results show that the film exhibits
a great nonlinear optical response.
Bismuth titanate, Bi4Ti3O12 (BTO), is a typical ferroelectric material with useful properties for optical memory,
piezoelectric and electro-optic devices. Its nano-crystals were compounded by the chemical solution decomposition
(CSD) technique. The structure and size of BTO were analyzed by X-ray diffraction (XRD) and transmissive electron
microscopy (TEM). Three sorts of composite films BTO/PEK-c with different BTO concentration were prepared by
spin-coating method at certain conditions. In this article, the scattering losses in thin films were obtained using the
photographic technique. The losses in the films with different BTO weight ratios were compared and analyzed.
We investigate the relationship between the hybrid form of center metal-atom and the third order nonlinear optical
property in a class of 1,3-dithiole-2-thione-4,5-dithiolato-S, S' bis-chelate transition metal complexes for the first time by
z-scan. We find that in bis-chelate complexes when the center metal-atom takes the sp3 hybrid form which construct a
tetrahedron construction have better third order nonlinear refraction property than in the form of dsp2 hybrid which
construct a plane construction and for nonlinear absorption property the case is quite contrary. Cation group have
shielding effect on both nonlinear refraction and nonlinear absorption property for this kind of materials.
Three novel dmit2- complexes: [(CH3)4N][Co(dmit)2], [(C3H7)4N][Co(dmit)2] and [(C4H9)4N][Co(dmit)2], (abbreviated
as MeCo, PrCo and BuCo, respectively and dmit2-=4,5-dithiolate-1,3-dithiole-2-thione), were synthesized and the third-order
optical nonlinearities of their acetone solution of the same concentration were characterized by Z-scan technique
at the wavelength of 1064 nm with laser duration of 40 ps. Their Z-scan curves all revealed a negative nonlinear
refraction and a positive absorption at 1064nm.The molecular second hyperpolarizability γ of MeCo, PrCo and BuCo
are 5.11×10-31, 4.99×10-31, 5.60×10-31 (esu), respectively. The linear absorption coefficients α and the nonlinear
absorption coefficient β of them are 0.3, 0.25, 0.32 (cm-1) and 1.53×10-12, 1.38×10-12, 1.85×10-12 (cm/W), respectively.
The experiment results suggested that complexes with stronger linear absorption have larger nonlinear absorption and
two-photon absorption. This difference is due to near resonant effect of sample with stronger absorption. So the linear
absorption of complexes at 1064nm is a significant factor to influence the nonlinear absorption. These samples' large
nonlinear absorption suggests that these materials have potential application in optical limiting.
In this letter, we report a new electro-optic (EO) polymer film DMACB/PEK-c. After poling of the film the refractive indices nt and nn, viz. the in-film-plane and the normal-to-film plane indices of refraction at 0.63-micrometer and the thickness d were determined using the quasi-waveguide m-line method. The electric field-induced changes in the refractive indices of the film, (delta) nt and (delta) nn, were also independently measured when an electric field was applied normal to the film plane. The EO coefficients of the film, (gamma) 13 and (gamma) 33, are found to be 32.9 pm/V and 82.6 pm/V respectively.
A new electro-optic polymer film PT/PEK-c has been prepared and investigated. This kind of film, especially c-axis oriented one, possesses good nonlinear optical properties. The structure of the film after poling was analyzed by x-ray diffraction. The result showed that the film was c-axis oriented. The transmittance of a 2.33-micrometer-thick film was measured in the wavelength range 320 to approximately 900 nm by means of a recording spectrophotometer. The transmittance of the film exhibited a sharp absorption edge at 360 nm. The optical band gap of the film was found to be 3.06 eV. The dielectric properties of PT/PEK-c film were investigated in terms of the dielectric constant (epsilon) r and the loss factor tg(delta) . They were measured by a capacitance bridge in the frequency range 1 X 102 approximately 3 X 106 Hz. The dielectric constant and the loss factor of a 2.33-micrometer-thick film at room temperature and 10 kHz frequency were determined to be 4.023 and 0.003, respectively.
Preparation, Stability and the optical properties of DMACB/PEK-c film were reported. The films have good transmittance and improved stability. By quasi-waveguide method. The refractive indices of the film, ne and no, were measured, which were 1.65800 and 1.63614 at 0.6328 micrometer, respectively; the film's electro-optic coefficients, (gamma) 33 and (gamma) 13 were also obtained, which were 80.80 pm/V and 32.88 pm/V, respectively.
A new electro-optic polymer film DMACB-PEK-c has been prepared. The refractive indices of the film at 0.63- micrometer, nt and nn, are determined by the quasi- waveguide m-line method. The results of measurement and calculation are: nt equals 1.6573 plus or minus 0.0017, nn equals 1.6278 plus or minus 0.0019.
Based on the analysis of the design theories for noncollinear acousto-opto tunable filter (AOTF) by considering the birefringence and the rotatory property of TeO2 crystal, this paper analyzed and accurately calculated the angular dependence for noncollinear AOTF between the acoustic polar angle (Theta) (alpha ) and the incident light polar angle (Theta) (iota ). The calculation pointed out that the approximation for the birefringence and the rotatory property of interaction material leads to an error more than 10% in the optimum incident angle for TeO2 at the wavelength of 6328 angstrom. This error will seriously degrade the design performances of the device. The resulting curves of various operating wavelengths obviously modified the original curve of Chang and it provided a theory basis for the device design of AOTF with large angular aperture.
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