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Absorption (blue curve) and photoluminescence (red curve) spectra of CdSe QDs in water at room temperature (excitation wavelength of 410 nm).
Microscope images of recorded grating structure in (a) transmission and (b) fluorescence (excitation band: 460–495 nm; detection band: 545–580 nm) microscope modes by using a fluorescence microscope (BX51, Olympus). Confocal Raman images of (c) the formed polymer and (d) CdSe QDs by using a confocal Raman microscope (LabRAM ARAMIS, HORIBA Jovin Yvon) equipped with an excitation laser at a wavelength of 633 nm. The measured film samples had 14 vol % comonomer and 0.34 vol % CdSe QDs.
Grating buildup dynamics for various concentrations of the comonomer with 0.34 vol % CdSe QDs. The diffraction efficiency was defined as the ratio of the first order diffracted signal power to the sum of the transmitted zeroth and the first order diffracted beam powers. The grating spacing was . The effective thicknesses estimated by curve fitting of Bragg-angle detuning data to Kogelnik’s formula were 54, 44, 45, 44, and for 0, 9, 14, 19, and 24 vol % comonomers, respectively.
Bragg-angle detuning curve of the diffraction efficiency for the recorded grating with 14 vol % comonomer. The solid curve is the least-squares fit of the data to Kogelnik’ formula.
Dependence of the saturated on CdSe QDs concentration with 14 vol % comonomer at a recording intensity of . The grating spacing was .
Dependence of the saturated on grating spacing with 14 vol % comonomer for various CdSe QDs concentrations (◇, 0.09; ●, 0.17; ○, 0.34 vol %). The recording intensity was .
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