scholarly journals Thin-Film Lithium Niobate Based Acousto-Optic Modulation Working at Higher-Order TE1 Mode

Photonics ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 12
Author(s):  
Yang Yang ◽  
Yin Xu ◽  
Dongmei Huang ◽  
Feng Li ◽  
Yue Dong ◽  
...  

Acousto-optic modulation (AOM) is regarded as an effective way to link multi-physical fields on-chip. We propose an on-chip AOM scheme based on the thin-film lithium niobate (TFLN) platform working at the higher-order TE1 mode, rather than the commonly used fundamental TE0 mode. Multi-physical field coupling analyses were carried out to obtain the refractive index change of the optical waveguide (>6.5×10−10 for a single phonon) induced by the enhanced acousto-optic interaction between the acoustic resonator mode and the multimode optical waveguide. By using a Mach-Zehnder interferometer (MZI) structure, the refractive index change is utilized to modulate the output spectrum of the MZI, thus achieving the AOM function. In the proposed AOM scheme, efficient mode conversion between the TE0 and TE1 mode is required in order to ensure that the AOM works at the higher-order TE1 mode in the MZI structure. Our results show that the half-wave-voltage-length product (VπL) is <0.01 V·cm, which is lower than that in some previous reports on AOM and electro-optic modulation (EOM) working at the fundamental TE0 mode (e.g., VπL > 0.04 V·cm for AOM, VπL > 1 V·cm for EOM). Finally, the proposed AOM has lower loss when compared with EOM because the electrode of the AOM can be placed far from the optical waveguide.

2020 ◽  
Vol 12 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Sankhyabrata Bandyopadhyay ◽  
Liyang shao ◽  
Mateusz Smietana ◽  
Chao Wang ◽  
Jie Hu ◽  
...  

1974 ◽  
Vol 25 (6) ◽  
pp. 329-331 ◽  
Author(s):  
David T. Y. Wei ◽  
William W. Lee ◽  
Louis R. Bloom

2004 ◽  
Author(s):  
Li Gui ◽  
Baoxi Xu ◽  
Dongjiang Wu ◽  
Yeow W. Goh ◽  
Tow C. Chong

2020 ◽  
Vol 41 (2) ◽  
pp. 145-151 ◽  
Author(s):  
Zaineb Gharsallah ◽  
Monia Najjar ◽  
Vijay Janyani

AbstractIn this work, an optical switch based on electro-optic effect is reported. We used defect mode in two-dimensional photonic crystal made of Lithium Niobate. Under an applied voltage of 3 V, a refractive index change of −0.0702 is obtained which has led to a transmittance contrast about 60% for the ON state and a high extinction ratio of about 20 dB. Moreover, Slow light structure performance is investigated to optimize proposed optic switch. Due to elliptic shape of holes, the applied voltage is decreased to 0.5 V. Also, a refractive index change decrease around −0.0481, a transmittance contrast increase 65 %, and an extinction ratio increase by 5 dB have been observed. We used plan wave expansion and finite difference time domain methods to analyze the structures performances. It is seen that a defect mode shift about 40 nm and a switching length of 6.48 μm are obtained with drive voltage of 3 V for simple structure and only 0.5 V for slow light structure.


2014 ◽  
Author(s):  
Shi-han Yang ◽  
Liang Zhang ◽  
Xue-song Lin ◽  
Jie Feng ◽  
Zi-gang Zhou ◽  
...  

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