Search Results - "Okada, Ryoma"

Polarization Image Sensor for Highly Sensitive Polarization Modulation Imaging Based on Stacked Polarizers by Sasagawa, Kiyotaka, Okada, Ryoma, Haruta, Makito, Takehara, Hironari, Tashiro, Hiroyuki, Ohta, Jun

“…In this article, We demonstrated an image sensor for detecting changes in polarization with high sensitivity. For this purpose, we constructed an optical…”
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Millimeter-Wave Band Electro-Optical Imaging System Using Polarization CMOS Image Sensor and Amplified Optical Local Oscillator Source by Okada, Ryoma, Mizuno, Maya, Nagaoka, Tomoaki, Takehara, Hironari, Haruta, Makito, Tashiro, Hiroyuki, Ohta, Jun, Sasagawa, Kiyotaka

“…In this study, we developed and demonstrated a millimeter-wave electric field imaging system using an electro-optic crystal and a highly sensitive polarization…”
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Exposure Time Control Method for Higher Intermediate Frequency in Optical Heterodyne Imaging and Its Application to Electric-Field Imaging Based on Electro-Optic Effect by Sasagawa, Kiyotaka, Okada, Ryoma, Akamatsu, Yoshihiro, Mizuno, Maya, Takehara, Hironari, Haruta, Makito, Tashiro, Hiroyuki, Ohta, Jun

“…We propose and demonstrate a method for equivalent time sampling using image sensors to selectively detect only the target frequency. Shortening the exposure…”
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Investigating the Influence of Morphine and Cocaine on the Mesolimbic Pathway Using a Novel Microimaging Platform by Ganaway, Austin, Tatsuta, Kousuke, Castillo, Virgil Christian Garcia, Okada, Ryoma, Sunaga, Yoshinori, Ohta, Yasumi, Ohta, Jun, Ohsawa, Masahiro, Akay, Metin, Akay, Yasemin M

“…Dopamine (DA)’s relationship with addiction is complex, and the related pathways in the mesocorticolimbic system are used to deliver DA, regulating both…”
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Laser-carbonized Electrodes on Implantable CMOS-based Imaging Device for Simultaneous Deep-brain Optical and Electrophysiological Measurements by Castillo, Virgil Christian G., Tso, Kuang-Chih, Okada, Ryoma, Ohta, Yasumi, Sunaga, Yoshinori, Sasagawa, Kiyotaka, Ohta, Jun

“…Optical and electrophysiological methods are widely used in neuroscience to study brain activity. Each technique has its own strengths and weaknesses that…”
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Implantable Multimodal Sensing Device for Simultaneous Imaging and Electrophysiological Recording of Mouse Brain Activity by Sugie, Kenji, Sasagawa, Kiyotaka, Okada, Ryoma, Ohta, Yasumi, Takehara, Hironari, Haruta, Makito, Tashiro, Hiroyuki, Ohta, Jun

“…Optical and electrophysiological measurements help us understand mouse brain functions. One type of device available for optical measurements is an implantable…”
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Multifunctional Implantable Device for Simultaneous Optical and Electrophysiological Measurements by Naganuma, Kyosuke, Ohta, Yasumi, Murakami, Takaaki E., Okada, Ryoma, Guinto, Mark Christian, Takehara, Hironari, Haruta, Makito, Tashiro, Hiroyuki, Sasagawa, Kiyotaka, Sunaga, Yoshinori, Akay, Yasemin M., Akay, Metin, Ohta, Jun

“…In neuroscience, it is crucial to clarify the relationship between single-cell activity and neural network structure to understand brain neural activity. To…”
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THz near-field intensity distribution imaging in the 0.3 THz band using a highly sensitive polarization CMOS image sensor using a 0.35 μm CMOS process by Okada, Ryoma, Mizuno, Maya, Nagaoka, Tomoaki, Takehara, Hironari, Haruta, Makito, Tashiro, Hiroyuki, Ohta, Jun, Sasagawa, Kiyotaka

“…Abstract In this paper, we propose a low-disturbance and fast terahertz (THz) near-field intensity distribution imaging method. The THz detector is fabricated…”
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Improvement of on-pixel polarizer with 0.35 μm CMOS process for electro-optic imaging systems by Okada, Ryoma, Sasagawa, Kiyotaka, Mizuno, Maya, Takehara, Hironari, Haruta, Makito, Tashiro, Hiroyuki, Ohta, Jun

“…Abstract In this paper, we propose an improved on-pixel polarizer structure for an image sensor, which was fabricated using the 0.35 μ m standard CMOS process…”
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Reflective high-sensitivity polarization change imaging using a dual polarizer structure by Sasagawa, Kiyotaka, Okada, Ryoma, Haruta, Makito, Takehara, Hironari, Tashiro, Hiroyuki, Ohta, Jun

“…In this study, we demonstrate a reflective imaging system in which a dual polarizer structure, consisting of a uniform polarizer and a polarizer on the pixel…”
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105-GHz Electric Field Visualization by Electro-Optic Imaging System Using Polarization Image Sensor by Sasagawa, Kiyotaka, Okada, Ryoma, Mizuno, Maya, Takehara, Hironari, Haruta, Makito, Tashiro, Hiroyuki, Ohta, Jun

“…In this paper, we present a system designed for visualization of high-frequency electric field distributions at 105 GHz. Our approach employs an electro-optic…”
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Sensitivity improvement in electro-optic imaging based on polarization CMOS image sensor by Okada, Ryoma, Mizuno, Maya, Takehara, Hironari, Haruta, Makito, Tashiro, Hiroyuki, Ohta, Jun, Sasagawa, Kiyotaka

“…In this study, we discuss the maximum signal-to-noise ratio (SNR) at 1GHz in the electric field imaging system that we have developed using the electro-optic…”
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Frame Interval Control Technique for High-Frequency Electric Field Imaging by Equivalent-Time Sampling by Sasagawa, Kiyotaka, Akamatsu, Yoshihiro, Okada, Ryoma, Mizuno, Maya, Takehara, Hironari, Haruta, Makito, Tashiro, Hiroyuki, Ohta, Jun

“…We propose an equivalent-time sampling method with controlled frame spacing to improve the intermediate frequency of field imaging systems. Simple…”
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RF Electric Field Imaging Based on Electro-Optic Effect By Using a Global Shutter Polarization Camera by Sasagawa, Kiyotaka, Okada, Ryoma, Mizuno, Maya, Haruta, Makito, Takehara, Hironari, Tashiro, Hiroyuki, Ohta, Jun

“…We demonstrate an electric field imaging system with a polarized image sensor, and perform equivalent sampling using a global shutter mechanism. We converted…”
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10-GHz Imaging by an Electro-Optic Imaging System Based on Polarization CMOS Image Sensor by Okada, Ryoma, Sasagawa, Kiyotaka, Mizuno, Maya, Takehara, Hironari, Haruta, Makito, Tashiro, Hiroyuki, Ohta, Jun

“…In this study, we demonstrate an electro-optic (EO) imaging system for 10 GHz. By using an optical modulator and an optical amplifier, we generated a…”
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Development of implantable multimodal sensor for optical and electrophysiological recording of mouse brain activity by Sugie, Kenji, Ohta, Yasumi, Haruta, Makito, Sasagawa, Kiyotaka, Okada, Ryoma, Takehara, Hironari, Tashiro, Hiroyuki, Ohta, Jun

“…In this study, we developed an implantable device for observing optical and electrophysiological signals from the mouse brain. The proposed multimodal sensor…”
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