Electronics Inspired Interdisciplinary Research Institute EIIRIS

Toyohashi, Japan

Electronics Inspired Interdisciplinary Research Institute EIIRIS

Toyohashi, Japan
SEARCH FILTERS
Time filter
Source Type

Mizutani S.,Toyohashi University of Technology | Okumura Y.,Toyohashi University of Technology | Horio T.,Toyohashi University of Technology | Iwata T.,Toyohashi University of Technology | And 7 more authors.
Sensors and Materials | Year: 2017

We report an enzyme-based potentiometric glutamate sensor combined with a semiconductor device for neurotransmitter imaging, the response of which is based on the detection of the interfacial potential of a gold electrode produced by redox and enzyme reactions. First, we confirmed that the interfacial potential increased logarithmically with the increasing concentration ratio of hexacyanoferrate(III) to hexacyanoferrate(II). The proposed sensor could detect the interfacial potential change of the gold electrode with a slope of 66.1 mV/decade. H2O2 and l-glutamate were detected as a function of the change in the interfacial potential of the gold electrode in the range of 0.01-1 mM. Slopes of 55.2 and 41.9 mV/decade were obtained as the sensitivities for H2O2 and l-glutamate, respectively. These estimated values are larger than the theoretical value of 29.5 mV/decade. Although the reason why the difference between the estimated value and the theoretical value occurred could not be revealed, the interfacial potential is expected to depend on some kind of reaction related to H2O2 concentration because the logarithmic response was obtained for H2O2 concentration. Therefore, the results suggested that the sensor can detect the l-glutamate concentration. © MYU K.K.


Masuya Y.,Toyohashi University of Technology | Ozawa R.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | Ishida M.,Japan Science and Technology Agency | And 5 more authors.
2015 Transducers - 2015 18th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2015 | Year: 2015

We developed an optical interferometeric surface-stress sensor which utilizes the nonlinear optical transmittance change in the Fabry-Perot interference to enhance the sensitivity of the surface-stress, integrated with a microfluidic channel for fast biosensing. A 30-μm-thick photosensitive dry film resist was laminated on the sensor, followed by a standard photolithography to form microfluidic channel. During the liquid supplying to the sensor, no liquid leakage into nano cavity was observed because output photocurrent shows constant. Photocurrent change of 8 nA was obtained when an anti-bovine serum albumin (BSA) with concentration of 100 ng/ml was injected with flow rate of 1 μl/min. Response time was successfully improved to be several tens of seconds. © 2015 IEEE.


Honma H.,Toyohashi University of Technology | Honma H.,Japan Society for the Promotion of Science | Takahashi K.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | And 3 more authors.
2015 Transducers - 2015 18th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2015 | Year: 2015

This paper presents a surface-plasmons-based tunable color filter using aluminum (Al) subwavelength grating operated by an electrostatic comb-drive actuator. We also fabricate the actuator integrated with an Al hinge and a stretchable parylene-C hinge that are used to constantly change the period of the Al subwavelength grating. Freestanding Al subwavelength grating with 450 nm pitch performed extraordinary optical transmission at 450 nm wavelength by TM-polarized light. We obtained a 225 nm displacement of the actuator having the stretchable hinges by applied voltage of 45 V, and a 750 nm displacement of the actuator having the Al hinges by applied voltage of 12 V. © 2015 IEEE.


Okabe K.,Toyohashi University of Technology | Akita I.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | Ishida M.,Electronics Inspired Interdisciplinary Research Institute EIIRIS
Japanese Journal of Applied Physics | Year: 2014

This paper presents a high-gain on-chip antenna using a sapphire substrate for implantable wireless medical systems. The antenna model is based on a dipole and the antenna elements are appropriately rolled for impedance matching. The center frequency of the fabricated on-chip antenna was measured as 360 MHz. The return loss was %3.58 dB and the input impedance was 190.5 % j74.7 at 360 MHz. The maximum antenna gain of the fabricated on-chip antenna was %29.2 dBi. The on-chip antenna using a sapphire substrate achieved a 12.9 dB higher gain than that using a silicon substrate and successfully induced signal transmission at a distance of 10cm with a transmitter chip. The implemented onchip antenna can improve the power efficiency of implantable wireless medical systems by 95%. © 2014 The Japan Society of Applied Physics.


Kumagai H.,Toyohashi University of Technology | Honma H.,Toyohashi University of Technology | Takahashi K.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | And 3 more authors.
International Conference on Optical MEMS and Nanophotonics | Year: 2014

In this study, we propose a flexible color filter based on surface plasmon using aluminum nanowire and nanodot array. Aluminum subwavelength lattice was formed on a parylene-N film and coated with parylene-N to avoid detachment from the substrate film. Both Al nanowire width of 250 nm and nanodot of 250 nm were successfully fabricated on the thin parylene-N film of 200 nm. Green color from the Al nanowire period of 450 nm was demonstrated. © 2014 University of Strathclyde.


Honma H.,Toyohashi University of Technology | Takahashi K.,Toyohashi University of Technology | Fukuhara M.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | And 3 more authors.
International Conference on Optical MEMS and Nanophotonics | Year: 2014

In this paper, we discuss a minimum filter size and duty ratio (= width/period) of a subwavelength Al grating for a tunable RGB color filter based on surface plasmons. An array of Al gratings was deployed over a through hole by sacrificial release process. The peak wavelength of the transmitted light was red-shifted by increasing the period of the subwavelength grating from 450 nm to 600 nm. We obtained enough transmission light intensity from the 10 μm square pixel-size including 20 Al nanowires. The noise-level was found to be dependent on the duty ratio and decreased with increase of the duty ratio. © 2014 University of Strathclyde.


Haibi H.,Toyohashi University of Technology | Akita I.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | Ishida M.,Electronics Inspired Interdisciplinary Research Institute EIIRIS
Proceedings of the 2013 IEEE Asian Solid-State Circuits Conference, A-SSCC 2013 | Year: 2013

This paper presents a low-noise small-area three-stage operational amplifier using split active-feedback compensation (SAFC) which is suitable for biomedical arrayed sensors. The proposed SAFC amplifier only requires a small capacitance for phase compensation, while it can achieve a low input-referred noise by increasing the first-stage transconductance without sacrificing the phase margin. The proposed SAFC amplifier has been implemented using a standard 0.18-μm CMOS process. The measurement results show that the proposed SAFC amplifier achieves >120-dB DC gain, 6.2-MHz gain bandwidth product, and phase margin of 60°. The measured input-referred noise is 27 nV/√Hz. The current dissipation is measured as 177 μA at a power supply of 1.5 V and it achieves a noise efficiency factor of 14. © 2013 IEEE.


Honma H.,Toyohashi University of Technology | Takahashi K.,Toyohashi University of Technology | Ishii H.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | And 3 more authors.
International Conference on Optical MEMS and Nanophotonics | Year: 2013

This paper presents a nanoelectromechanical system (NEMS) variable transmission attenuator based on a gap variable subwavelength grating with a low drive voltage. An array of parallel-plate actuators is deployed over a through hole. The transmitted light intensity decreased from 63.3% to 46.5% with a drive voltage of 3.2 V at a wavelength of 775 nm. © 2013 IEEE.


Yamasaki K.,Toyohashi University of Technology | Nakazawa H.,Toyohashi University of Technology | Nakazawa H.,Chiyoda Corporation | Misawa N.,Toyohashi University of Technology | And 6 more authors.
BIODEVICES 2012 - Proceedings of the International Conference on Biomedical Electronics and Devices | Year: 2012

This study describes a biosensor for single nucleotide polymorphism (SNP) genotyping based on the filterless fluorescence detection methods. The filterless fluorescence sensor is able to distinguish lights with more than two different wavelengths without optical filters, mirrors, and gratings. From the final results, we observed that emission lights form the "fluorescein isothiocyanate (i.e., FITC)" and the "sulforhodamine 101 acid chloride (i.e., Texas Red)", which are kinds of fluorescent dyes commonly used in SNP genotyping, were detected with less interference using the filterless fluorescence sensor. Thus, our approach is effective for SNP genotyping with low cost and high portability.


Akita I.,Toyohashi University of Technology | Ishida M.,Toyohashi University of Technology | Ishida M.,Electronics Inspired Interdisciplinary Research Institute EIIRIS
Digest of Technical Papers - IEEE International Solid-State Circuits Conference | Year: 2013

A small-area low-power low-noise instrumentation amplifier (IA) is desired in arrayed sensor devices that are used for high-spatial-resolution biomedical and environment monitoring systems. This paper presents a 0.06mm2 chopper-stabilized current-feedback IA with 13.5nV/√Hz input-referred noise and less than 3.5μV offset voltage. For significantly reducing the ripple due to chopping, the proposed IA uses a novel digital calibration scheme, namely, automatic differential-pair matching (ADPM), which enables a small die area and low-power operation. The proposed IA is implemented in a standard 0.18μm CMOS and achieves a noise efficiency factor (NEF) of 7.2 while drawing 194μA. The active area of the IA is 7.8× smaller than that of the state-of-the-art [1-5] while it maintains low output ripple, low noise, and low power. © 2013 IEEE.

Loading Electronics Inspired Interdisciplinary Research Institute EIIRIS collaborators
Loading Electronics Inspired Interdisciplinary Research Institute EIIRIS collaborators