[ED2] Detector and Readout 1

3:46 PM - 4:01 PM JST(6:46 AM - 7:01 AM UTC)

[ED2-04] Phonon-mediated superconducting LEKIDs with surface activated bonding technology for high-energy particle detection

*Chiko Otani^1,2, Ryota Ito^1,2, Yuto Kamei¹, Toru Taino³, Satoru Mima⁴, Takunori Taira^5,6 (1. RIKEN RAP (Japan), 2. Tohoku University (Japan), 3. Saitama University (Japan), 4. NICT (Japan), 5. IMS (Japan), 6. RIKEN SPring-8 (Japan))

Keywords:

KID,Detector,Particle,Phonon

We have developed phonon-mediated superconducting lumped-element kinetic inductance detectors (LEKIDs) using a stoichiometric lithium niobate (sLN) substrate. To reduce the strong piezoelectric losses in LN during microwave readout signal application, we employed surface activated bonding (SAB) technology to bond the LN and sapphire substrates, and then fabricated LEKIDs on the sapphire substrate. This approach allows us to spatially separate the LEKID electrodes from the LN substrate, resulting the reduction of the piezoelectric effect. Then, the internal quality factor (Q_i) of the LEKID resonators was improved by approximately a factor of 1,800. Furthermore, we successfully demonstrated particle detection by observing phonon-mediated pulse signals generated by α-ray irradiation (5.4 MeV) from ²⁴¹Am to the LN substrate. These results highlight the potential of phonon-mediated detectors using SAB technology.
Presentation Materials
https://iss-archives.jp/iss2025.jp/slides/ED2-04.pdf