High-Q germanium optical nanocavity

Ting-Hui Xiao; Ziqiang Zhao; Wen Zhou; Mitsuru Takenaka; Hon Ki Tsang; Zhenzhou Cheng; Keisuke Goda

doi:10.1364/PRJ.6.000925

Journals >Photonics Research >Volume 6 >Issue 9 >Page 925 > Article

Photonics Research
Vol. 6, Issue 9, 925 (2018)

Ting-Hui Xiao^1,†, Ziqiang Zhao^2,†, Wen Zhou^3,†, Mitsuru Takenaka²..., Hon Ki Tsang³, Zhenzhou Cheng^1,* and Keisuke Goda^1,4,5|Show fewer author(s)

Author Affiliations

¹Department of Chemistry, The University of Tokyo, Tokyo 113-0033, Japan

²Department of Electrical Engineering and Information Systems, The University of Tokyo, Tokyo 113-0033, Japan

³Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China

⁴Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA

⁵e-mail: goda@chem.s.u-tokyo.ac.jp

show less

DOI: 10.1364/PRJ.6.000925 Cite this Article Set citation alerts

Ting-Hui Xiao, Ziqiang Zhao, Wen Zhou, Mitsuru Takenaka, Hon Ki Tsang, Zhenzhou Cheng, Keisuke Goda, "High-Q germanium optical nanocavity," Photonics Res. 6, 925 (2018) Copy Citation Text

EndNote(RIS)

BibTex

Plain Text

show less

Schematic of the monolithically integrated on-chip MIR germanium device that contains a high-Q nanocavity, two suspended-membrane waveguides, and two focusing subwavelength grating couplers. The inset to the bottom left shows the design of the high-Q nanocavity. The inset to the bottom right shows a cross-sectional view of a suspended-membrane waveguide.

Fig. 1. Schematic of the monolithically integrated on-chip MIR germanium device that contains a high-Q nanocavity, two suspended-membrane waveguides, and two focusing subwavelength grating couplers. The inset to the bottom left shows the design of the high-Q nanocavity. The inset to the bottom right shows a cross-sectional view of a suspended-membrane waveguide.

Download full size | View in the Article

SEM images of the MIR germanium device, including the high-Q nanocavity. (a) Top view of the device. Scale bar: 10 μm. (b) Top view of the high-Q nanocavity. Scale bar: 500 nm.

Fig. 2. SEM images of the MIR germanium device, including the high-Q nanocavity. (a) Top view of the device. Scale bar: 10 μm. (b) Top view of the high-Q nanocavity. Scale bar: 500 nm.

Download full size | View in the Article

Fig. 3. Experimental characterization of the MIR germanium device, including the high-Q nanocavity. (a) Measured transmission spectrum of the device (blue) and measured coupling efficiency of the focusing subwavelength grating couplers (red). (b) Lorentzian fitting of the measured nanocavity resonant mode. The inset shows the electric field magnitude distribution of the resonant mode.

Download full size | View in the Article

Geometry	Wavelength	$Q$ Factor	Cavity Type	Reference
Photonic crystal cavity	2.5 μm	$\sim 18,000$	Nanocavity	This work
Photonic crystal cavity	2.3 μm	$\sim 200$	Nanocavity	[24]
Racetrack microring	5.3 μm	$\sim 20,000$	Microcavity	[20]
Racetrack microring	3.8 μm	$\sim 5000$	Microcavity	[28]

Table 1. Comparison of MIR Germanium Cavities

Ting-Hui Xiao, Ziqiang Zhao, Wen Zhou, Mitsuru Takenaka, Hon Ki Tsang, Zhenzhou Cheng, Keisuke Goda, "High-Q germanium optical nanocavity," Photonics Res. 6, 925 (2018)

Download Citation

EndNote(RIS)

BibTex

Plain Text

Set citation alerts for the article

Tools

Set citation alerts for the article

Save the article for my favorites

Paper Information

微信扫一扫：分享

微信扫一扫：分享