著者

水谷 五郎 趙 越 Hien Thi Thu Khuat 岡島 麻衣子 金子 達雄

出版者

公益社団法人 日本薬学会

雑誌

YAKUGAKU ZASSHI (ISSN:00316903)

巻号頁・発行日

vol.139, no.3, pp.351-362, 2019-03-01 (Released:2019-03-01)

参考文献数

42

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Second-order nonlinear optical images of aggregates of the ampholytic megamolecular polysaccharide sacran under various stimuli were observed by optical second-harmonic generation (SHG) microscopy. SHG intensity microspots of several tens of micrometers in size are seen for sacran cotton-like lumps and fibers and they have very clear incident polarization dependence. In these microspots, the sacran molecules are oriented in concentric multilayers. We also observed SHG images of sacran prepared in a needle-ring electrode with applied voltage, where SHG was enhanced near the negatively biased needle electrode. We also observed SHG signals near the cast film edges of sacran. The appearance of the SHG image suggested a phase-separation structure in sacran aggregates. These results show that sacran molecules aggregate in several different ways.

著者

佐野 陽之 水谷 五郎

出版者

公益社団法人 日本表面科学会

雑誌

表面科学 (ISSN:03885321)

巻号頁・発行日

vol.28, no.12, pp.711-717, 2007-12-10 (Released:2007-12-16)

参考文献数

17

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We have developed optical sum frequency (SF) and second harmonic (SH) microscopy as a new surface probe. In this paper, recent three studies performed by the SF (SH) microscopy are presented. (1) The spatial distribution of electronic states of an arsenic ion implanted Si(111) substrate was observed by using a wavelength tunable SH microscope. Resonant SH images associated with Eg and E2 energy gaps were obtained at the SH photon energies of 2.33 and 4.43 eV, respectively. (2) It was demonstrated that the spatial distribution of hydrogen desorption by laser pulses from a hydrogen terminated Si surface can be observed by the SH microscope. In the case of irradiation of ultraviolet short laser pulses, the hydrogen desorption occurred above the threshold fluence of ∼40 mJ/cm2, suggesting that the hydrogen desorption probably resulted from the laser induced thermal desorption (LITD) mechanism. (3) It was demonstrated that nondestructive chemical analysis of starch granules in a water plant can be performedby using SH and SF microscopy.

著者

水谷 五郎 宮内 良広 佐野 陽之 KHUAT Hien

出版者

北陸先端科学技術大学院大学

雑誌

基盤研究(C)

巻号頁・発行日

2011-04-28

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MgO(210)ファセット面上にPtを斜め蒸着し、線幅2nm間隔7nmのPtナノワイヤ列の製作に成功した。このワイヤ列のSHGは、7nmの線幅のPtナノワイヤよりも強度が数10倍強く、その原因としてワイヤ内電子の量子閉じ込め効果を推測した。MgO(210)ファセット面上にPdを斜め蒸着した膜の透過電顕像はナノワイヤの長さの方向に長いモアレ構造を示した。またステップ構造を持つTiO2上にAuを蒸着した膜の製作に成功した。現在これらの試料のSHG応答を計測している。またクロム薄膜に加工したナノホール列のSHG応答、Siステップ表面上のHのSFG応答から表面上のミクロ構造を担った重要な情報を得た。