Optimization of suspended ladder BG silicon sensors for high wavelength or amplitude sensitivity. - Siim Heinsalu; Yuichi Matsushima; Hiroshi Ishikawa; Katsuyuki Utaka (IEEE SENSORS, 2021)

Sensitivity improvement for silicon MS-SW BG sensors by waveguide height increase or by waveguide suspension with supporting shape modification. - Siim Heinsalu; Anna Kawano; Yuji Isogai; Yuichi Matsushima; Hiroshi Ishikawa; Katsuyuki Utaka (OFC, 2021)

Sensitivity Improvement of Multi-Slot Subwavelength Bragg Grating Refractive Index Sensors by Increasing the Waveguide Height or Suspending the Sensor. - Siim Heinsalu; Katsuyuki Utaka (Sensors, 2022)

Temperature-Insensitive pulse and 120℃ CW Operation of 1550nm-Band p-doped InAs/InGaAlAs Quantum Dot Lasers on InP(311)B Substrate. - Ryota Yabuki; Atsushi Matsumoto; Ryumi Katsuhara; Siim Heinsalu; Koichi Akahane; Yuichi Matsushima; Hiroshi Ishikawa; Katsuyuki Utaka (OFC, 2023)

Design and Experiment of Silicon Racetrack-Loop Multi-Mode Waveguide Structure with Low-Loss and Adjustable Couplings for Compact Reservoir Computing Device. - Siim Heinsalu; Katsuyuki Utaka (PSC, 2023)

Low-Power Switching of Polymer Mach-Zhender Type Optical Switch with 45° Mirror for Vertical Interconnection. - Ryo Kuwata; Siim Heinsalu; Yuichi Matsushima; Hiroshi Ishikawa; Katsuyuki Utaka (PSC, 2023)

Low Threshold and 10kHz-Class Narrow Linewidth 1.55 µm-Band Quantum Dot Laser Diode on InP(311)B Substrate. - Atsushi Matsumoto; Ryota Yabuki; Shinya Nakajima; Toshimasa Umezawa; Siim Heinsalu; Yuichi Matsushima; Koichi Akahane; Naokatsu Yamamoto; Katsuyuki Utaka (OFC, 2024)

Input and Output Port-Adjacent Silicon Photonics PILOSS Switch for Wafer-Scale Optical Interconnections. - Siim Heinsalu; Ryotaro Konoike; Keijiro Suzuki; Kazuhiro Ikeda (OFC, 2025)