Fully CMOS-Compatible Room-Temperature Waveguide-Integrated Bolometer Based on Germanium-on-Insulator Platform at Mid-Infrared Operating Beyond 4 μm
- Title
- Fully CMOS-Compatible Room-Temperature Waveguide-Integrated Bolometer Based on Germanium-on-Insulator Platform at Mid-Infrared Operating Beyond 4 μm
- Authors
- Shim, Joonsup; Lim, Jinha; Kim, Inki; Kim, Seong Kwang; Ahn, Seung-Yeop; Park, Juhyuk; Jeong, Jaeyong; Kim, Bong Ho; Lee, Seunghyeon; An, Jihwan; Geum, Dae-Myeong; Kim, SangHyeon
- Date Issued
- 2023-12-09
- Publisher
- IEEE
- Abstract
- We propose a novel concept of an uncooled waveguide-integrated bolometer on a Ge-on-insulator (Ge-OI) platform at mid-infrared (MIR) wavelength of 4.18 µm. To induce heat generation, we introduce a heavily-doped (p+) Ge that utilizes the mechanism of free-carrier absorption (FCA) in Ge. A bolometric material of H2 plasma-treated TiO2 film is integrated to facilitate highly efficient thermal-to-electrical conversion. The fabricated waveguide-integrated bolometer exhibits outstanding performance characteristics in the temperature coefficient of resistance (TCR) of - 1.911 %/K and a sensitivity of -22.25 %/mW at room temperature. Our proposed detector offers full complementary metal-oxide-semiconductor (CMOS) compatibility and features a remarkably simple device configuration. Moreover, due to its FCA-induced heating, we anticipate that our approach can cover the entire MIR regime without performance degradation. This work experimentally demonstrates a room-temperature waveguide-integrated bolometer operating beyond 4 µm, for the first time to our knowledge, paving the way towards the development of a fully integrated photonic platform capable of operating in the ultra-wide MIR spectral region. © 2023 IEEE.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/120751
- Article Type
- Conference
- Citation
- 2023 International Electron Devices Meeting (IEDM), 2023-12-09
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