Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Compact lithium niobate plasmonic modulator

Open Access Open Access

Abstract

Lithium niobate (LN)-based modulators offer superior modulation performances, including high-speed modulation, linearity, and temperature stability. However, these devices exhibit larger sizes due to the low light–matter interaction despite a significant electro-optic coefficient. In this work, we present a compact LN-based modulator using a plasmonic mode that confines the optical mode in a very narrow gap. By filling the gap with LN, the confinement factor in the LN is significantly enhanced. The proposed modulator provides an extremely small half-wave voltage–length product, VπL of 0.02 V/cm at an optical communication wavelength (λ = 1.55 µm). The proposed modulator scheme can be utilized in a wide range of optical communication devices that demand small footprints and a high-speed operation.

© 2024 Optica Publishing Group

Full Article  |  PDF Article
More Like This
Hyperband electro-optic modulator based on a two-pulley coupled lithium niobate racetrack resonator

Hyeon Hwang, Mohamad Reza Nurrahman, Hyungjun Heo, Kiyoung Ko, Kiwon Moon, Jung Jin Ju, Sang-Wook Han, Hojoong Jung, Hansuek Lee, and Min-Kyo Seo
Opt. Lett. 49(3) 658-661 (2024)

Compact optical 90° hybrid based on a wedge-shaped 2 × 4 MMI coupler and a 2 × 2 MMI coupler on a thin-film lithium niobate platform

Yake Chen, Xiaojun Xie, Yang Sun, Wei Pan, and Lianshan Yan
Opt. Lett. 49(5) 1145-1148 (2024)

Ultra-compact electro-optic phase modulator based on a lithium niobate topological slow light waveguide

Ying Wang, HongMing Fei, Han Lin, Jie Bai, MingDa Zhang, Xin Liu, BinZhao Cao, Yuan Tian, and LianTuan Xiao
Opt. Express 32(3) 3980-3988 (2024)

Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (5)

Fig. 1.
Fig. 1. Cross section of a plasmonic x-cut LN modulator. hLN is the height of LN and wLN is the width of LN in the gap.
Fig. 2.
Fig. 2. Simulated (a) RF and (b) optical mode profiles of the plasmonic modulator.
Fig. 3.
Fig. 3. LN confinement factor for the LN-filled plasmonic modulator (red line) and the SiO2-filled plasmonic LN modulator (blue line) as a function of (a) LN height (hLN) and (b) LN width (wLN)
Fig. 4.
Fig. 4. VπL and the propagation loss of the LN-filled modulator as a function of (a) LN width and (b) LN height. Red and blue curves represent the VπL and the propagation loss, respectively.
Fig. 5.
Fig. 5. VπL and the propagation loss of the LN plasmonic modulator with nonvertical sidewall as a function of wtLN. LN in the gap is shaped as a trapezoid, where wtLN is the top LN width and α is the angle of the sidewall. The inset illustrates the cross section of the plasmonic modulator with a nonvertical sidewall.
Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved