Nanoparticle-Enhanced Photopolymerization

Ueno, Kosei; Juodkazis, Saulius; Shibuya, Toshiyuki; Mizeikis, Vygantas; Yokota, Yukie; Misawa, Hiroaki

doi:10.1021/jp901773k

Cited by 72 publications

(74 citation statements)

References 29 publications

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“…Moreover, because the density of the electric charge is highest at the ends of the metal particles that are aligned with the electric field of the incident light, the electromagnetic field concentrates at the ends of the particles along the incident polarization. 39,40 This phenomenon results in the temporary spatial confinement of light at the metallic nanoparticle surface as a consequence of the LSPR excitation. 22,41 Therefore, on the metallic nanoparticle surface, the electromagnetic field is enhanced by roughly two orders of magnitude compared with the electromagnetic field intensity of the incident light.…”

Section: Optical Antenna Effect Induced By Lsprmentioning

confidence: 99%

Plasmon-enhanced photocurrent generation and water oxidation from visible to near-infrared wavelengths

Ueno

Misawa

2013

NPG Asia Mater

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This paper presents recent investigations of plasmon-enhanced photoelectric conversion and water oxidation by visible and nearinfrared light irradiation. Since the discovery of the Honda-Fujishima effect in 1972, significant efforts have been devoted to lengthening the light-energy conversion wavelength. In this context, plasmonic photoelectric conversion has been recently demonstrated at visible-to-near-infrared wavelengths without deteriorating photoelectric conversion by employing titanium dioxide (TiO 2 ) single-crystal photoelectrodes, in which gold nanorods are elaborately arrayed on the surface. A potassium perchlorate aqueous solution was employed as an electrolyte solution without additional electron donors; thus, water molecules provided the electrons. The stoichiometric evolution of oxygen and hydrogen peroxide as a result of the four-or two-electron oxidation of water molecules, respectively, was accomplished with near-infrared light irradiation using the plasmonic optical antenna effect. As there is very little overpotential for water oxidation, these results constitute a significant advancement in this field. In addition, this photoelectric conversion system could potentially be employed in artificial photosynthesis systems that exceed the photosynthetic capabilities of plants by allowing for photoconversion over a wide range of wavelengths.

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Section: Optical Antenna Effect Induced By Lsprmentioning

confidence: 99%

Plasmon-enhanced photocurrent generation and water oxidation from visible to near-infrared wavelengths

Ueno

Misawa

2013

NPG Asia Mater

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“…The symmetry of these structures obscures the distinction between the L-and T-modes, and their collective response is a mixture of these modes. 97 At higher exposure levels, photopolymerization gradually proceeded not only in the nanogaps, but also at both edges of the gold nanoblocks along the polarization direction, as shown in performed (data not shown). Although the reaction rate is different than that obtained with laser irradiance, an analogous tendency can be observed to that illustrated in Figure 6.…”

Section: Two-photon-induced Photopolymerization On Nanogap Gold Strucmentioning

confidence: 59%

“…39,97 The geometry of the nanogap gold structures used in this experiment is described in Figure 4a, and the planar patterns consist of diagonally aligned squares with edge lengths of 120 nm separated by 10 nm-wide gaps between their nearest corners. The designed size of each gold nanoblock is 120 nm © 120 nm © 40 nm, and this design results in plasmonic extinction peaks between 700 and 800 nm.…”

Section: Two-photon-induced Photopolymerization On Nanogap Gold Strucmentioning

confidence: 99%

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Fabrication of Nanoengineered Metallic Structures and Their Application to Nonlinear Photochemical Reactions

Ueno

Misawa

2012

Bulletin of the Chemical Society of Japan

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We used metallic nanoparticles exhibiting localized surface plasmon resonance and electromagnetic (EM) field enhancement effects induced by plasmon excitation for the photochemical reaction field; this approach makes it possible to increase the probability of an interaction between photons and the materials. EM field enhancement effects induced by gold nanostructures were elucidated using two-photon-induced photoluminescence from nanogap-spaced gold nanoparticles. The photoluminescence was promoted mainly in the surface regions of the gold nanoblocks adjacent to the nanogaps due to the EM field enhancement effect. To elucidate the near-field intensity distribution of the nanogap gold structures, we investigated the photopolymerization of a commercially available negative photoresist assisted by EM field enhancement in the nanogaps separating the gold nanoblocks. Photopolymerization rates were enhanced by several orders of magnitude in the gold nanoblock structures that contained nanogaps narrower than 10 nm. We propose two surface plasmon-assisted nanolithography techniques based on spatially selective photochemical reactions promoted by the EM field enhancement effect. The first method uses ultimate near-field lithography with a local near-field distribution induced in the nanogaps, and the second technique uses the scattering component of multipole plasmon resonance as an exposure mechanism. These lithographic techniques represent a type of application based on plasmon-enhanced chemical reactions.

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“…2(a). The sample was fabricated on a glass substrate by using electron beam lithography (EBL) and lift-off techniques [16,22]. Briefly put, the EBL technique was used to define masks of planar patterns of nanostructures on substrates and thin gold films were deposited over the mask by sputtering.…”

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confidence: 99%

Optical trapping through the localized surface-plasmon resonance of engineered gold nanoblock pairs

Tanaka¹,

Sasaki²

2011

Opt. Express

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Abstract:We have investigated the plasmonic trapping of dielectric nanoparticles by using engineered gold nanoblock pairs with ~5-nm gaps. Pairs with surface-plasmon resonance peaks at the incident wavelength allow the trapping of 350-nm-diameter nanoparticles with 200 W/cm 2 laser intensities, and their plasmon resonance properties and trapping performance are drastically modified by varying the nanoblock size of ~20%. In addition, plasmon resonance properties of nanoblock pairs strongly depend on the direction of the linear polarization of the incident laser, which determines the trapping performance. ©2011 Optical Society of America References and links1. K. Okamoto and S. Kawata, "Radiation force exerted on subwavelength particles near a nanoaperture," Phys.Rev. Lett. 83(22), 4534-4537 (1999). 2. P. C. Chaumet, A. Rahmani, and M. Nieto-Vesperinas, "Optical trapping and manipulation of nano-objects with an apertureless probe," Phys.

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Nanoparticle-Enhanced Photopolymerization

Cited by 72 publications

References 29 publications

Plasmon-enhanced photocurrent generation and water oxidation from visible to near-infrared wavelengths

Plasmon-enhanced photocurrent generation and water oxidation from visible to near-infrared wavelengths

Fabrication of Nanoengineered Metallic Structures and Their Application to Nonlinear Photochemical Reactions

Optical trapping through the localized surface-plasmon resonance of engineered gold nanoblock pairs

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