Toshiaki Hattori
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View article: Tunable terahertz source on a chip with decade-long stability using layered-superconductor elliptical microcavities
Tunable terahertz source on a chip with decade-long stability using layered-superconductor elliptical microcavities Open
Chip-scale, electrically tunable, continuous-wave, coherent terahertz (THz) radiation sources are critical for emerging applications in sensing, imaging, spectroscopy, communications, space, and quantum technologies. Here, we demonstrate a…
View article: Terahertz source-on-a-chip with decade-long stability using layered superconductor elliptical microcavities
Terahertz source-on-a-chip with decade-long stability using layered superconductor elliptical microcavities Open
Coherent, continuous-wave, and electrically tunable chip-scale terahertz (THz) sources are critical for emerging applications in sensing, imaging, spectroscopy, communication, space and quantum technologies. Here, we demonstrate a robust s…
View article: Validation of a Simple Device for Measuring Urinary Sodium-to-potassium Concentration Ratio
Validation of a Simple Device for Measuring Urinary Sodium-to-potassium Concentration Ratio Open
View article: Colloidal titration: from the perspective of stability constants between oppositely charged polyelectrolytes
Colloidal titration: from the perspective of stability constants between oppositely charged polyelectrolytes Open
Colloidal titration is a unique method to measure the concentration of charged groups based on the association between cationic and anionic colloids. Titrimetry must involve a unidirectional reaction with a large formation constant. Howeve…
View article: Terahertz Spectroscopic Study of Liquid-Liquid Phase Separation of Protein Solutions
Terahertz Spectroscopic Study of Liquid-Liquid Phase Separation of Protein Solutions Open
View article: Terahertz imaging system with on-chip superconducting Josephson plasma emitters for nondestructive testing
Terahertz imaging system with on-chip superconducting Josephson plasma emitters for nondestructive testing Open
Compared with adjacent microwaves and infrared frequencies, terahertz (THz) frequency offers numerous advantages for imaging applications. The unique THz spectral signatures of chemicals allow the development of THz imaging systems for non…
View article: Singular matrices and geometry at infinity of products of symmetric spaces
Singular matrices and geometry at infinity of products of symmetric spaces Open
Let $\mathbf{k}$ be a number field and $\mathbf{k}_M$ the Minkowski space associated to $\mathbf{k}$. Dirichlet's theorem in Diophantine approximation is generalized to the case of systems of linear forms with coefficients in $\mathbf{k}_M…
View article: Evaluation of Ca<sup>2+</sup> Adsorption Property for a Single Grain of Strongly Acidic Cation-exchange Resin Using a Ca<sup>2+</sup> Image Sensor and Its Simulation with Concentration Diffusion
Evaluation of Ca<sup>2+</sup> Adsorption Property for a Single Grain of Strongly Acidic Cation-exchange Resin Using a Ca<sup>2+</sup> Image Sensor and Its Simulation with Concentration Diffusion Open
Ion exchange resins are widely used to product pure water and in the purification and measurement of substances in various fields. The physical and chemical properties of resins are generally evaluated by a batch method and/or a column met…
View article: Diophantine approximation in number fields and geometry of products of symmetric spaces
Diophantine approximation in number fields and geometry of products of symmetric spaces Open
Dirichlet's theorem in Diophantine approximation is known to be closely related to geometry of the hyperbolic plane. In this paper we consider approximation in the setting of number fields and study relation between systems of linear forms…
View article: Tuning transmission properties of 3D printed metal rod arrays by breaking the structural symmetry
Tuning transmission properties of 3D printed metal rod arrays by breaking the structural symmetry Open
In this work, one metallic photonic crystal waveguide composed of periodic metal rod arrays (MRAs) is experimentally and numerically demonstrated in terahertz frequencies. Such waveguides fabricated by 3D printers exhibit two resonant mode…
View article: Sharp resonances in terahertz free-standing three-dimensional metallic woven meshes
Sharp resonances in terahertz free-standing three-dimensional metallic woven meshes Open
Free-standing structures that do not require any holder or substrate show high levels of flexibility and stretchability and hence are well-suited for THz applications. In this work, a free-standing three-dimensional metallic woven mesh is …
View article: Evaluation of Removal Behavior of Cesium in Contaminated Soil Based on Speciation Analysis
Evaluation of Removal Behavior of Cesium in Contaminated Soil Based on Speciation Analysis Open
View article: Investigation of geometry-dependent field properties of 3D printed metallic photonic crystals
Investigation of geometry-dependent field properties of 3D printed metallic photonic crystals Open
One terahertz (THz) waveguide based on 3D printed metallic photonic crystals is experimentally and numerically demonstrated in 0.1-0.6 THz, which consists of periodic metal rod arrays (MRAs). Results demonstrated that such waveguide suppor…
View article: Characterization of Calcium Ion Release from a Polymer-Coated Electrode with a Plasticized PVC Membrane Containing Calcium Salts, and Its Contraction Examination of <i>Vorticella Convallaria</i>
Characterization of Calcium Ion Release from a Polymer-Coated Electrode with a Plasticized PVC Membrane Containing Calcium Salts, and Its Contraction Examination of <i>Vorticella Convallaria</i> Open
Up to now several bio-imaging methods have taken very good pictures and/or recordings. With bio-imaging growing, a micro-stimulation method to limit in a fine region is required. Conventional chemical stimulation methods face difficulty in…
View article: Terahertz Fano-like resonators based on free-standing metallic wire woven meshes
Terahertz Fano-like resonators based on free-standing metallic wire woven meshes Open
Most periodic terahertz (THz) structures need a substrate to support; thus, additional absorption occurs, resulting in a low quality (Q) factor. Free-standing structures that do not require any holder or substrate show high levels of flexi…
View article: Development of Flow-based Ion Image Sensor with Multi Flow Paths and Its Application to ELISA
Development of Flow-based Ion Image Sensor with Multi Flow Paths and Its Application to ELISA Open
著者らは，これまで多数の電位差センシング素子を二次元に配置した半導体センサである「二次元電気化学イオンセンサアレイ」を開発し，主に二次元の動的イオンイメージ画像の取得を行ってきた．本研究では，本イオンセンサアレイのフロー系への応用を検討するため，128 × 128個のイオンセンサ素子を配置したセンサ感応面上に三流路を形成して連続的に溶液を供給するフロー系システムを開発した．まず，本システムを組み込んだイオンセンサアレイを使用して，3種のpH標準液の計測を行ったところ，pH …
View article: CCD Multi-Ion Image Sensor with Four 128 × 128 Pixels Array
CCD Multi-Ion Image Sensor with Four 128 × 128 Pixels Array Open
A semiconductor array pH image sensor consisting of four separated blocks was fabricated using charged coupled device (CCD) and complementary metal oxide semiconductor (CMOS) technologies. The sensing surface of one of the four blocks was …
View article: Geometry-dependent modal field properties of metal-rod-array-based terahertz waveguides
Geometry-dependent modal field properties of metal-rod-array-based terahertz waveguides Open
One terahertz (THz) waveguide based on the metal rod array (MRA) structure is numerically demonstrated in 0.1-1 THz, including the fundamental and high-order transverse magnetic (TM) modes.The high-order TM-mode THz waves are strictly conf…
View article: Effect of Hydrothermal Reaction Temperature on Properties of Bismuth Nanoparticles and Its Properties as Modified Electrode for Pb Sensors
Effect of Hydrothermal Reaction Temperature on Properties of Bismuth Nanoparticles and Its Properties as Modified Electrode for Pb Sensors Open
Heavy metal pollution is a common environmental problems. Therefore a versatile method that can be used to detect heavy metal ions on field is sought after. Electrochemical sensor is a promising method for heavy metal detection, however, e…
View article: Investigation of spectral properties and lateral confinement of THz waves on a metal-rod-array-based photonic crystal waveguide
Investigation of spectral properties and lateral confinement of THz waves on a metal-rod-array-based photonic crystal waveguide Open
Terahertz (THz) waves laterally confined in a 1 mm-thick microstructured planar waveguide are demonstrated on a free-standing metal rod array (MRA), and one apparent rejection band of a transmission spectrum, resembling the bandgap of a ph…
View article: Extracellular Bio-imaging of Acetylcholine-stimulated PC12 Cells Using a Calcium and Potassium Multi-ion Image Sensor
Extracellular Bio-imaging of Acetylcholine-stimulated PC12 Cells Using a Calcium and Potassium Multi-ion Image Sensor Open
View article: Terahertz artificial material based on integrated metal-rod-array for phase sensitive fluid detection
Terahertz artificial material based on integrated metal-rod-array for phase sensitive fluid detection Open
A terahertz artificial material composed of metal rod array is experimentally investigated on its transmission spectral property and successfully incorporated into microfluidics as a miniaturized terahertz waveguide with an extended optica…
View article: Fabrication and Evaluation of Calcium Ion Releasing Electrochemical Device Using a Ternary Complex
Fabrication and Evaluation of Calcium Ion Releasing Electrochemical Device Using a Ternary Complex Open
電極活性陽イオン界面活性剤とCa2＋が高分子陰イオンと静電的に結合した三元系錯体を調製し，この三元系錯体を含むカーボンペースト（CP）電極によりCa2＋放出電気化学デバイスを作製した．ポリビニル硫酸（PVS－）とその半当量の11-フェロセニルトリメチルウンデシルアンモニウム（FeTMUA＋）を含む混合溶液を調製し，その混合溶液に塩化カルシウムを加えて三元系錯体の沈殿を得た．FeTMUA＋に応答する脂溶性陽イオン選択性電極とCa2＋選択性電極を用いて，FeTMUA・PVS錯体…
View article: Salt effects on the picosecond dynamics of lysozyme hydration water investigated by terahertz time-domain spectroscopy and an insight into the Hofmeister series for protein stability and solubility
Salt effects on the picosecond dynamics of lysozyme hydration water investigated by terahertz time-domain spectroscopy and an insight into the Hofmeister series for protein stability and solubility Open
The addition of salts into protein aqueous solutions causes changes in protein solubility and stability, the ability of which is known to be ordered in the Hofmeister series.
View article: Improving a Terahertz Time-Domain Spectroscopy Apparatus Using Neodymium Magnets
Improving a Terahertz Time-Domain Spectroscopy Apparatus Using Neodymium Magnets Open
The signal-to-noise ratio obtained from terahertz time-domain spectroscopy is significantly affected by the low available power of terahertz waves. We constructed a terahertz-wave source with emission power enhanced by a magnetic field. Th…
View article: All-optically stabilized frequency comb
All-optically stabilized frequency comb Open
We present an all-optically stabilized, erbium-doped mode-locked fiber laser with an optically pumped ytterbium-doped fiber. The mode-locked fiber laser has two frequency-control actuators that are pump laser powers for erbium-doped and yt…
View article: Improving a Terahertz Time-Domain Spectroscopy Apparatus Using Neodymium Magnets
Improving a Terahertz Time-Domain Spectroscopy Apparatus Using Neodymium Magnets Open
The signal-to-noise ratio obtained from terahertz time-domain spectroscopy is significantly affected by the low available power of terahertz waves. We constructed a terahertz-wave source with emission power enhanced by a magnetic field. Th…
View article: Effect of Bias Electrode Position on Terahertz Radiation From Pentagonal Mesas of Superconducting <formula formulatype="inline"><tex Notation="TeX">${\hbox{Bi}}_{2}{\hbox{Sr}}_{2}{\hbox{CaCu}}_{2}{\hbox{O}}_{8+\delta}$</tex> </formula>
Effect of Bias Electrode Position on Terahertz Radiation From Pentagonal Mesas of Superconducting ${\hbox{Bi}}_{2}{\hbox{Sr}}_{2}{\hbox{CaCu}}_{2}{\hbox{O}}_{8+\delta}$ Open
We examined the effect of the bias current position on the radiation of intense and coherent terahertz electromagnetic waves from the intrinsic Josephson junctions (IJJs) in regular pentagonal mesas of single crystalline high- superconduct…
View article: 30am2-C-1 Developments of Sensor Devices and System for ultra-early diagnosis of cardiovascular and cerebral diseases
30am2-C-1 Developments of Sensor Devices and System for ultra-early diagnosis of cardiovascular and cerebral diseases Open
We have been developing an easy to use, low-cost, rapid, and high sensitivity semiconductor based medical diagnostic biosensing system for analyzing blood and urine for early diagnosis. The new biosensing technology consists of a semicondu…
View article: Real-time monitoring of inhibitory effects on glutamate-induced neurotransmitter release using a potassium ion image sensor
Real-time monitoring of inhibitory effects on glutamate-induced neurotransmitter release using a potassium ion image sensor Open
To directly image the release of neurotransmitters from neurons, we combined a substance-selective layer with a 128 × 128–pixel ion image sensor based on CMOS technology. Using the substance-specific image sensors, we studied the dynamics …