Relaxation behavior of nonlinear optical response in borate glasses containing gold nanoparticles

Sasai, Jun; Hirao, Kazuyuki

doi:10.1063/1.1355279

Cited by 68 publications

(30 citation statements)

References 25 publications

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“…However, it was not until Michael Faraday's pioneering work in the mid 19th century [2] that the science behind the formation and properties of such sols was described. Recently, gold dispersions have been widely used in numerous applications, including electronics [3,4], nonlinear optics [5,6], catalysis [7][8][9], SERS [10,11], pigments [12,13], sensors [14,15], biosensors [16][17][18][19], and drug delivery [20]. Among the many available processes for the preparation of such particles, the reduction in homogeneous solutions remains the simplest and most versatile method.…”

Section: Introductionmentioning

confidence: 99%

Preparation and stabilization of monodisperse colloidal gold by reduction with aminodextran

Morrow

Matijević

Goia

2009

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Preparation and stabilization of monodisperse colloidal gold by reduction with aminodextran

Morrow

Matijević

Goia

2009

Journal of Colloid and Interface Science

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“…So the nonlinear absorption should owe to the existence of ZnSe nanocrystals. And the higher the soaking concentration of the samples is, the faster the transmittance value descended at positions close to the focus [13].…”

Section: Methodsmentioning

confidence: 98%

Preparation and physical properties of Nano-ZnSe/SiO2 mesoporous composite for assembly system

2007

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A novel synthesis route of ZnSe/gel-glass mesoporous composite was described. SeO 2À 4 and Zn 2+ were loaded into the porous framework of silica gel-glasses by immersion. Followed by drying and the reductive thermal treatment, the transparent, homogeneous ZnSe/SiO 2 samples with the color of light yellow were prepared. The specific surface area, grain size, structure and phase properties of nano-sized ZnSe/SiO 2 mesoporous composites were studied by powder X-ray diffraction, nitrogen sorption, SEM. The effects of pore structure properties and loading solution concentration on the optical absorption of ZnSe/SiO 2 were investigated by UV-vis absorption. It is found that the optical absorption edges of ZnSe nanoparticles in mesoporous silica shift to the red as ZnSe loading concentration increases, which is attributed to the quantum size effect. The nonlinear optical property of these samples was presented by the open aperture z-scan technique. This method has some potential advantages in comparison to the conventional methods.

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“…38 The ultrafast time response of t 2 is mainly caused by the relaxation of the third-order nonlinear response of gold nanoparticles and hot electron injection from the gold nanoprism to ITO. [39][40][41] To further confirm the ultra-low power alloptical tunability, we adopted a closed-aperture Z-scan scheme to measure the effective three-order nonlinear refractive index n 2 of the film composed of ZnO nanoparticles and multilayer-graphene microsheets (Figure 5b). 42 The measured result for the effective nonlinear refractive index n 2 was 28.03 3 10 27 cm 2 W 21 .…”

Section: Resultsmentioning

confidence: 99%

An actively ultrafast tunable giant slow-light effect in ultrathin nonlinear metasurfaces

Shi

et al. 2015

Light Sci Appl

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A slow-light effect based on metamaterial-induced transparency (MIT) possesses great practical applications for integrated photonic devices. However, to date, only very weak slow-light effects have been obtained in metamaterials because of the intrinsic loss of metal. Moreover, no active control of slow-light has been achieved in metamaterials. Here, we report the realization of a giant slow-light effect on an ultrathin metasurface that consists of periodic arrays of gold nanoprism dimers with a thickness of 40 nm sandwiched between a multilayer-graphene micro-sheet/zinc oxide nanoparticle layer and a monolayer graphene/polycrystalline indium tin oxide layer. The strong field confinement of the plasmonic modes associated with the MIT ensures a tremendous reduction in the group velocity around the transparency window. A group index of more than 4 3 10 3 is achieved, which is one order of magnitude greater than that of previous reports. A large tunable wavelength range of 120 nm is achieved around the center of the transparency window when the pump light intensity is only 1.5 kW cm 22 . The response time is as fast as 42.3 ps. These results demonstrate the potential for the realization of various functional integrated photonic devices based on metasurfaces, such as all-optical buffers and all-optical switches. INTRODUCTIONThe slow-light effect plays an essential role in the field of nonlinear optics. Typical materials that have been used to achieve the slow-light effect include photonic crystals, optical fibers, and optical microcavities. [1][2][3][4][5] Recently, the slow-light effect has been realized based on metamaterial-induced transparency (MIT). 6-11 However, only a small group index of 100 was obtained in photonic metamaterials because of the relatively large intrinsic loss of metal. 6-11 Moreover, various functional integrated photonic devices, including ultrafast all-optical buffers and all-optical switches, require ultrafast control of the slow-light effect. Photonic metasurfaces offer a variety of opportunities to control light using flat and surface components and have attracted wide attention for their great practical applications in the field, such as optical computing, optical communications, and integrated photonic circuits. [12][13][14][15][16][17] To date, no ultrafast active control of the slow-light effect in metamaterials has been reported.In this letter, we report the realization of an ultrafast all-optical tunable giant slow-light effect in an ultrathin metasurface. The metasurface consists of periodic arrays of gold nanoprism dimers sandwiched between a multilayer-graphene micro-sheet/zinc oxide (ZnO) nanoparticle layer and a monolayer graphene/polycrystalline indium tin oxide (ITO) layer. The strong field confinement of the plasmonic modes associated with the MIT ensures a large reduction in the group velocity in the transparency window. The enhanced nonlinearity brought about by the quantum confinement (QC) effect provided by the ZnO nanoparticles and polycrystalline ITO nanograins, hot...

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Relaxation behavior of nonlinear optical response in borate glasses containing gold nanoparticles

Cited by 68 publications

References 25 publications

Preparation and stabilization of monodisperse colloidal gold by reduction with aminodextran

Preparation and stabilization of monodisperse colloidal gold by reduction with aminodextran

Preparation and physical properties of Nano-ZnSe/SiO2 mesoporous composite for assembly system

An actively ultrafast tunable giant slow-light effect in ultrathin nonlinear metasurfaces

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