Nobuhide Yokota

2014.4-2022.9: Assistant professor, Research Institute of Electrical Communication, Tohoku University, Japan
2022.10-present: Associate professor, Research Institute of Electrical Communication, Tohoku University, Japan

Education

Ph.D. in Graduate School of Materials Science, Nara Institute of Science and Technology, Japan, 2014
M.S. in Graduate School of Materials Science, Nara Institute of Science and Technology, Japan, 2011
B.S. in Department of Electrical Engineering, Kochi National College of Technology, Japan, 2009

Research interests

photonics, semiconductor spintronics

Achievement

[Journal publications]
  1. H. Yasaka, N. Yokota, T. Shindo, and W. Kobayashi, "Improvement in bandwidth of an electro-absorption modulator by optical pre-emphasis utilizing photon-photon resonance," IEICE Electron. Express 21, 20230594 (2024).
  2. S. Asami, N. Yokota, W. Kobayashi, T. Shindo, and H. Yasaka, "Numerical analysis of negative chirp operation in hybrid modulation semiconductor lasers," IEICE Electron. Express 20, 20230268 (2023).
  3. N. Yokota, T. Nohara, and H. Yasaka, "Wide-Bandwidth and High-Sensitivity Measurement Technique of Intrinsic Modulation Response of Semiconductor Lasers," IEEE Photon. J. 15, 5800106 (2023).
  4. N. Yokota, K. Ikeda, and H. Yasaka, "Observation of spin polarization modulation responses of injection-locked vertical-cavity surface-emitting lasers," IEICE Electron. Express 20, 20230057 (2023).
  5. S. Sato, K. Sugaya, K. Nakanishi, N. Yokota, M. Kohda, and K. Morita, "Characterization of the out-of-plane Dresselhaus effective magnetic field in InGaAs/InAlAs (110) multiple quantum wells at room temperature," Jpn. J. Appl. Phys. 62, 048001 (2023).
  6. T. Shima, N. Yokota, M. Yoshida, W. Kobayashi, and H. Yasaka, "Measurement of 124-GHz E/O Modulation Bandwidth in Hybrid Modulation Laser," IEEE Photon. Technol. Lett. 35, 565 (2023).
  7. H. Yasaka, W. Kobayashi, and N. Yokota, "Numerical Analysis of 100-Gbit/s Dynamic Single-Mode Operation of Hybrid-Modulation Semiconductor Lasers," IEEE J. Quantum Electron. 59, 1200107 (2023).
  8. N. Yokota, H. Kiuchi, and H. Yasaka, "Directly modulated optical negative feedback lasers for long-range FMCW LiDAR," Opt. Express 30, 11693 (2022).
  9. A. Arikawa, Y. Saito, K. Nakanishi, S. Sato, K. Sugaya, N. Yokota, M. Kohda, and K. Morita, "D'yakonov-Perel and Elliot-Yafet spin relaxation rates in InGaAs/InAlAs multiple quantum wells at room temperature," Appl. Phys. Express 15, 043001 (2022).
  10. K. Nakanishi, A. Arikawa, Y. Saito, D. Iizasa, S. Iba, Y. Ohno, N. Yokota, M. Kohda, Y. Ishitani, and K. Morita, "Room-temperature spin-orbit magnetic fields in slightly misoriented (110) InGaAs/InAlAs multiple quantum wells," Appl. Phys. Lett. 119, 032405 (2021).
  11. N. Yokota and H. Yasaka, "Spin Laser Local Oscillators for Homodyne Detection in Coherent Optical Communications," Micromachines 12, 573 (2021).
  12. N. Yokota, K. Ikeda, and H. Yasaka, "Spin-Injected Birefringent VCSELs for Analog Radio-Over-Fiber Systems," IEEE Photon. Technol. Lett. 33, 297 (2021).
  13. N. Yokota and H. Yasaka, "Cascaded SSB comb generation using injection-locked seed lasers," Opt. Lett. 46, 769 (2021).
  14. N. Yokota, H. Kiuchi, and H. Yasaka, "Role of modulation bandwidth in narrow spectral linewidth semiconductor lasers under optical negative feedback," Jpn. J. Appl. Phys. 59, 102001 (2020).
  15. M. Kanno, N. Yokota, and H. Yasaka, "Measurement of Intrinsic Modulation Bandwidth of Hybrid Modulation Laser," IEEE Photon. Technol. Lett. 32, 839 (2020).
  16. S. Sato, G. Aizawa, N. Yokota, and H. Yasaka, "Performance improvement of optical negative feedback laser by reducing feedback loop length," IEICE Electron. Express 17, 20190750 (2020).
  17. N. Yokota and H. Yasaka, "Multi-wavelength discrete pulse train generation using chromatic aberration of time lens for ultrafast single-shot optical imaging," Opt. Rev. 26, 713 (2019).
  18. N. Yokota, K. Komukai, M. Yoshida, and H. Yasaka, "Numerical Investigation of Mutually Injection-Locked Semiconductor Lasers for Direct IQ-Signal Generation," IEEE Photon. J. 11, 6602611 (2019).
  19. N. Yokota, K. Nisaka, H. Yasaka, and K. Ikeda, "Spin polarization modulation for high-speed vertical-cavity surface-emitting lasers," Appl. Phys. Lett. 113, 171102 (2018).
  20. K. Aoyama, S. Kobayashi, M. Wada, N. Yokota, T. Kita, and H. Yasaka, "Compact narrow-linewidth optical negative feedback laser with Si optical filter," Appl. Phys. Express 11, 112703 (2018).
  21. K. Aoyama, N. Yokota, and H. Yasaka, "Strategy of optical negative feedback for narrow linewidth semiconductor lasers," Opt. Express 26, 21159 (2018).
  22. M. Kanno, S. Mieda, N. Yokota, W. Kobayashi, and H. Yasaka, "Chirp Control of Semiconductor Laser by Using Hybrid Modulation (Invited)," IEICE Trans. Electron. E101-C, 561 (2018).
  23. K. Aoyama, N. Yokota, and H. Yasaka, "3-kHz Spectral Linewidth Laser Assembly With Coherent Optical Negative Feedback," IEEE Photon. Technol. Lett. 30, 277 (2018).
  24. N. Yokota, R. Igarashi, and H. Yasaka, "Optical Nyquist pulse generation by using a dual-electrode Mach-Zehnder modulator," Opt. Lett. 42, 1856 (2017). Highlighted as Editor's Pick
  25. N. Yokota, R. Takeuchi, H. Yasaka, and K. Ikeda, "Lasing Polarization Characteristics in 1.55- m Spin-Injected VCSELs," IEEE Photon. Technol. Lett. 29, 711 (2017).
  26. S. Mieda, N. Yokota, R. Isshiki, W. Kobayashi, and H. Yasaka, "Frequency response control of semiconductor laser by using hybrid modulation scheme," Opt. Express 24, 25824 (2016).
  27. N. Yokota and H. Yasaka, "Operation Strategy of InP Mach-Zehnder Modulators for Flat Optical Frequency Comb Generation," IEEE J. Quantum. Electron. 52, 5200207 (2016).
  28. S. Mieda, N. Yokota, W. Kobayashi, and H. Yasaka, "Ultra-Wide-Bandwidth Optically-Controlled DFB Laser with External Cavity," IEEE J. Quantum. Electron. 52, 2200107 (2016).
  29. N. Yokota, K. Abe, S. Mieda, and H. Yasaka, "Harmonic superposition for tailored optical frequency comb generation by a Mach-Zehnder modulator," Opt. Lett. 41, 1026 (2016).
  30. N. Yokota, Y. Aoshima, K. Ikeda, N. Nishizawa, H. Munekata, and H. Kawaguchi, "Room temperature spin injection into (110) GaAs quantum wells using Fe/x-AlOx contacts in the regime of current density comparable to laser oscillation," J. Appl. Phys. 118, 163905 (2015).
  31. N. Yokota, T. Miki, K. Abe, and H. Yasaka, "Nonlinearity of Semiconductor Mach-Zehnder Modulator for Flat Optical Frequency Comb," IEEE Photon. Technol. Lett. 27, 2219 (2015).
  32. S. Mieda, S. Shiratori, N. Yokota, W. Kobayashi, and H. Yasaka, "Intra-cavity loss modulation for ultra-high-speed direct modulation lasers based on photon-photon resonance," Appl. Phys. Express 8, 082701 (2015).
  33. K. Aoyama, R. Yoshioka, N. Yokota, W. Kobayashi, and H. Yasaka, "Optical Negative Feedback for Linewidth Reduction of Semiconductor Lasers," IEEE Photon. Technol. Lett. 27, 340 (2015).
  34. S. Mieda, S. Shiratori, N. Yokota, W. Kobayashi, H. Yasaka, "Ultra-high-speed Operation of Laser Diode with External Cavity by Cross-gain Modulation," Appl. Phys. Express 8, 022701 (2015).
  35. K. Aoyama, R. Yoshioka, N. Yokota, W. Kobayashi, and H. Yasaka, "Experimental Demonstration of Linewidth Reduction of Laser Diode by Compact Coherent Optical Negative Feedback System," Appl. Phys. Express 7, 122701 (2014). Highlighted by Nature Photonics, vol. 9, p. 7, Jan. 2015.
  36. N. Yokota, Y. Yasuda, K. Ikeda, and H. Kawaguchi, "Electron spin relaxation time in (110) InGaAs/InAlAs quantum wells," J. Appl. Phys. 116, 023507 (2014).
  37. N. Yokota, Y. Aoshima, K. Ikeda, and H. Kawaguchi, "Room temperature spin transport in undoped (110) GaAs/AlGaAs quantum wells," Appl. Phys. Lett. 104, 072406 (2014).
  38. Y. Tsunemi, N. Yokota, S. Majima, K. Ikeda, T. Katayama, and H. Kawaguchi, "1.55-um VCSEL with polarization-independent HCG mirror on SOI," Opt. Express 21, 28685 (2013).
  39. N. Yokota, Y. Tsunemi, K. Ikeda, and H. Kawaguchi, "Pump Probe Measurement of Electron Spin Relaxation Time in (110)-Oriented GaAs/AlGaAs Multiple Quantum Well Microposts," Appl. Phys. Express 5, 122401 (2012).
  40. N. Yokota, K. Ikeda, and H. Kawaguchi, "Comparison of measurement techniques for electron spin relaxation time in a GaAs/AlGaAs multiple quantum well," Physica E 44, 1176 (2012).
  41. N. Yokota, K. Ikeda, Y. Nishizaki, S. Koh, and H. Kawaguchi, "Carrier Lifetime and Electron Spin Relaxation Time in (110)-Oriented GaAs-AlGaAs Quantum-Well Micro-Posts," IEEE Photon. Technol. Lett. 22, 1689 (2010).

[International conference]

  1. N. Yokota, H. Takahashi, K. Sugiyasu, and H. Yasaka, "Zooming Operation of FMCW LiDAR: Toward Applications in Rescue," IEEE 12th Global Conference on Consumer Electronics (GCCE), pp. 181-182, Nara, 10-13 Oct. 2023.
  2. N. Yokota, H. Yasaka, K. Sugiyasu, and H. Takahashi, "Time Domain Analysis for Extracting Spatial Distribution of Visible Light IDs," IEEE 11th Global Conference on Consumer Electronics (GCCE), pp. 437-438, Osaka, 18-21 Oct. 2022.
  3. N. Yokota, H. Takahashi, and H. Yasaka, "Detection and Manipulation of Laser Projection Pattern for Effective Evacuation Guidance," IEEE 11th Global Conference on Consumer Electronics (GCCE), pp. 160-161, Osaka, 18-21 Oct. 2022. Excellent Poster Award
  4. N. Yokota, K. Ikeda, and H. Yasaka, "Injection-locked spin-VCSELs for coherent optical communications (Invited)," SPIE Optics+Photonics, paper 12205-43, San Diego, CA, 21-25 Aug. 2022.
  5. K. Uchiyama, N. Yokota, W. Kobayashi, and H. Yasaka, "Numerical Analysis of Hybrid Modulation Semiconductor Lasers for 100 Gbit/s Dynamic Single Mode Operation," 27th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing (OECC/PSC 2022), paper WD1-4, Japan, Jul. 3-6, 2022.
  6. T. Shima, M. Yoshida, N. Yokota, W. Kobayashi, and H. Yasaka, "Measurement of Wide-band Modulation Characteristic in Hybrid Modulation Laser," 27th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing (OECC/PSC 2022), paper WD1-3, Japan, Jul. 3-6, 2022.
  7. T. Komatsubara, T. Okachi, N. Yokota, H. Yasaka, and T. Kita, "Narrow linewidth hybrid wavelength-tunable laser with optical negative feedback circuit," IEEE 17th International Conference on Group IV Photonics (GFP), ThB1.7, Online, Dec. 2021.
  8. K. Sugaya, K. Nakanishi, D. Iizasa, S. Iba, Y. Ohno, N. Yokota, M. Kohda, Y. Ishitani, and K. Morita, "Room-temperature spin dynamics in (110) InGaAs quantum wells," 24th International Conference on Electronic Properties of Two-Dimensional Systems, E-PS-1-04, Online, Oct.-Nov. 2021.
  9. N. Yokota, H. Yasaka, K. Sugiyasu, and H. Takahashi, "Improving Detection Tolerance of Visible Light IDs with Two-Color Differential Detection Scheme," IEEE 10th Global Conference on Consumer Electronics (GCCE), pp.931-932, Online, 12-15 Oct. 2021.
  10. N. Yokota, H. Kiuchi, and H. Yasaka, "Low-phase-noise optical negative feedback laser for long-distance ranging with high signal-to-noise ratio," 27th International Semiconductor Laser Conference (ISLC), WA1.3, Online, 10-14 Oct. 2021.
  11. N. Yokota, K. Ikeda, and H. Yasaka, "Spin-VCSELs for analog radio-over-fiber systems in 5G and beyond (Invited)," SPIE Optics+Photonics, paper 11805-42, Online, 1-5 Aug. 2021.
  12. H. Takahashi, K. Katayama, N. Yokota, and K. Sugiyasu, "Evacuation Guide Supporting System using UAV for Coastal Area," 2021 IEEE 3rd Global Conference on Life Sciences and Technologies (LifeTech), pp.235-236, Online, 9-11 Mar. 2021.
  13. N. Yokota, H. Yasaka, K. Sugiyasu, and H. Takahashi, "Motion-Tolerant Method for Extracting Spatially Distributed Visible Light IDs," 2020 IEEE 9th Global Conference on Consumer Electronics (GCCE), pp.267-268, Online, 13-16 Oct. 2020.
  14. N. Yokota, K. Ikeda, and H. Yasaka, "Numerical investigation of direct IQ modulation of spin-VCSELs for coherent communications (Invited)," SPIE Optics+Photonics, paper 11470-87, Online, 24-28 Aug. 2020.
  15. N. Yokota, H. Yasaka, K. Sugiyasu, and H. Takahashi, "Spatial Distribution Extraction of Visible Light IDs for Supporting Robotic Rescue Efforts," 2019 IEEE 8th Global Conference on Consumer Electronics (GCCE), pp.7-8, Osaka, Japan, 15-18 Oct. 2019. Excellent Paper Award
  16. K. Sugiyasu, H. Takahashi, N. Yokota, K. Sugiyama, and K. Onodera, "Method of Decreasing Dead Angle Zone under the Tsunami Evacuation Patrol used by UAVs," 2019 IEEE 8th Global Conference on Consumer Electronics (GCCE), pp.1060-1061, Osaka, Japan, 15-18 Oct. 2019.
  17. N. Yokota, K. Nisaka, K. Ikeda, and H. Yasaka, "Spin polarization modulation of 1.55- m VCSELs for high-speed data communications (Invited)," SPIE OPTICS+PHOTONICS, paper 11090-114, San Diego, CA, 11-15 Aug. 2019.
  18. K. Katayama, H. Takahashi, N. Yokota, K. Sugiyasu, G. Kitagata, and T. Kinoshita, "An Effective Multi-UAVs-based Evacuation Guidance Support for Disaster Risk Reduction," 2019 IEEE International Conference on Big Data and Smart Computing (BigComp), pp. 1-6, Kyoto, Japan, 27 Feb.-2 Mar. 2019.
  19. N. Yokota, H. Yasaka, K. Sugiyasu, and H. Takahashi, "Motion Tolerance for Dynamic Object Recognition Using Visible Light IDs," IEEE 7th Global Conference on Consumer Electronics (GCCE), pp.667-668, Nara, Japan, 9-12 Oct. 2018.
  20. K. Katayama, H. Takahashi, N. Yokota, K. Sugiyasu, and T. Kinoshita, "Cooperation Scheme of Multi-UAVs for Evacuation Guidance Support," IEEE 7th Global Conference on Consumer Electronics (GCCE), pp.189-190, Nara, Japan, 9-12 Oct. 2018.
  21. K. Sugiyasu, S. Sasaki, N. Araya, H. Takahashi, N. Yokota, K. Katayama, and M. Matsumoto, "Assessment Method of Tsunami Evacuating Behavior Used by GPS and GIS," IEEE 7th Global Conference on Consumer Electronics (GCCE), pp.191-192, Nara, Japan, 9-12 Oct. 2018.
  22. K. Katayama, H. Takahashi, N. Yokota, K. Sugiyasu, and T. Kinoshita, "Design and Implementation of Multiagent-based Evacuation Guidance Support System using UAVs," The 9th IEEE International Conference on Awareness Science and Technology (iCAST), pp.196-201, Fukuoka, Japan, 19-21 Sep. 2018.
  23. N. Yokota, K. Nisaka, H. Yasaka, and K. Ikeda, "High-Speed Modulation of 1.55- m VCSELs with Spin Polarization Modulation," Conference on Lasers and Electro-Optics (CLEO), paper STu3Q.2, San Jose, CA, 13-18 May. 2018.
  24. K. Aoyama, S. Kobayashi, M. Wada, N. Yokota, and H. Yasaka, "Stable and Narrow Linewidth Semiconductor Laser Assembly with Coherent Optical Negative Feedback," Conference on Lasers and Electro-Optics (CLEO), paper JTu5A.101, San Jose, CA, 14-19 May. 2017.
  25. S. Mieda, R. Isshiki, N. Yokota, W. Kobayashi, H. Yasaka, "Tailoring of Semiconductor Laser fs Frequency Response by Hybrid Modulation Scheme," 25th International Semiconductor Laser Conference (ISLC 2016), paper WE23, Kobe, Japan, 12-15 Sep. 2016.
  26. S. Mieda, N. Yokota, W. Kobayashi, and H. Yasaka, "Transmission Performance Improvement of Semiconductor Lasers by Hybrid Modulation Scheme," Compound Semiconductor Week (CSW), paper ThD1-7.4, Toyama, Japan, 26-30 Jun. 2016.
  27. N. Yokota, K. Abe, S. Mieda, R. Igarashi, and H. Yasaka, "Tailoring of Optical Frequency Comb Shape by Harmonic Signal Superposition in Mach-Zehnder Modulator," Conference on Lasers and Electro-Optics (CLEO), paper SF1G.4, San Jose, CA, 5-10 Jun. 2016.
  28. S. Mieda, N. Yokota, W. Kobayashi, and H. Yasaka, "Ultra-high-speed semiconductor light source for next-generation optical communication system (Invited)," Energy Materials Nanotechnology (EMN) Meeting, paper T11, Beijing, China, 21-25 Apr. 2016.
  29. H. Yasaka, K. Aoyama, and N. Yokota, "Phase Noise Reduction in Semiconductor Lasers by Optical Negative Feedback (Invited)," SPIE Photonics Europe 2016, Paper 9892-12, Brussels, Belgium, 3-7 Apr. 2016.
  30. N. Yokota, K. Ikeda, N. Nishizawa, H. Munekata, and H. Kawaguchi, "Electron spin injection and transport in (110) quantum wells for room temperature operation of spin-controlled vertical-cavity surface-emitting lasers (Invited)," SPIE OPTICS+PHOTONICS, Paper 9551-41, San Diego, California, USA, 9-13 Aug. 2015.
  31. N. Yokota, T. Miki, K. Abe, E. Yamada, and H. Yasaka, "Numerical Analysis for Optical Frequency Comb Generated by Semiconductor Mach-Zehnder Modulator," The 20th Optoelectronics and Communications Conference (OECC 2015), paper JWeC.23, Shanghai, China, Jun.28-Jul.2, 2015.
  32. S. Mieda, S. Shiratori, N. Yokota, W. Kobayashi, and H. Yasaka, "Gently-sloped Small Signal Response by Intra-cavity Loss Modulation," The 20th Optoelectronics and Communications Conference (OECC 2015), paper JTuA.24, Shanghai, China, Jun.28-Jul.2, 2015.
  33. K. Aoyama, R. Yoshioka, N. Yokota, W. Kobayashi, and H. Yasaka, "Narrow-linewidth Laser Diode with Compact Optical-feedback System," 2014 International Topical Meeting on Microwave Photonics / The 9th Asia-Pacific Microwave Photonics Conference (MWP/APMP 2014), paper TuEA-2, Hokkaido, Japan, October 2014.
  34. S. Mieda, S. Shiratori, N. Yokota, W. Kobayashi, and H. Yasaka, "High-speed Optically Controlled Semiconductor Light Source with an External Cavity," 2014 International Topical Meeting on Microwave Photonics / The 9th Asia-Pacific Microwave Photonics Conference (MWP/APMP 2014), paper TuEB-6, Hokkaido, Japan, October 2014.
  35. H. Yasaka, K. Aoyama, R. Yoshioka, and N. Yokota, "Compact Narrow Linewidth Semiconductor Laser Source," 4th RIEC-RLE Meeting on Research Collaboration in Photonics, pp. 206-213, Sendai, Japan, July 2014.
  36. Y. Tsunemi, N. Yokota, S. Majima, K. Ikeda, T. Katayama, and H. Kawaguchi, "Room Temperature Operation of Optically Pumped 1.55-um VCSEL with Polarization-Independent HCG Mirror on SOI," Conference on Lasers and Electro-Optics (CLEO), paper SW3G.4, San Jose, CA, June 2014.
  37. N. Yokota, K. Ikeda, and H. Kawaguchi, "Space- and Time-Resolved Observation of Electron Spin Transport in a (110) GaAs/AlGaAs Multiple Quantum Well at Room Temperature," The 58th Annual Magnetism and Magnetic Materials Conference, paper DP-5, Denver, Colorado, USA, November 2013.
  38. N. Yokota, K. Ikeda, and H. Kawaguchi, "(110)-Oriented GaAs/AlGaAs Multiple Quantum Well Microposts for High-Speed Polarization Switching of Spin-Controlled VCSELs," The European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference (CLEO/Europe-IQEC), paper CF/IE-P.31, Munich, Germany, May 2013.
  39. N. Yokota, K. Ikeda, S. Koh, and H. Kawaguchi, "Spin-controlled switching of lasing circular polarizations in (110)-oriented VCSELs, h SPIE Photonics West, paper 7937-28, San Francisco, California, USA, January 2011.
  40. N. Yokota, K. Ikeda, S. Koh, and H. Kawaguchi, "Evaluation of carrier lifetime and electron spin relaxation time in (110)-oriented GaAs/AlGaAs quantum well micro-posts," GIST-NCTU-NAIST International Exchange Program, Nara, Japan, November 2010.
  41. K. Ikeda, Y. Nishizaki, N. Yokota, K. Ohnishi, S. Koh, and H. Kawaguchi, "Shortening of carrier lifetime and its effect on electron spin relaxation time in GaAs/AlGaAs (110) multiple quantum wells," The International Conference on Nanophotonics (OSA Topical Meeting), paper P-B20, Tsukuba, Japan, June 2010.