A tunable dielectric loaded structure with built in transverse mode suppression

2004 ◽  
Author(s):  
A. Kanareykin ◽  
A. Altmark ◽  
I. Sheinman
Keyword(s):  
Transverse Mode ◽  
Mode Suppression ◽  
Loaded Structure

Influence of displacement and patterning of phase shifters for piston mode operation of temperature compensated surface acoustic wave resonators on SiO2/LiNbO3 structure

2021 ◽  
Author(s):  
Keyuan Gong ◽  
Zhaohui Wu ◽  
Yu-Po Wong ◽  
Yawei Li ◽  
Qi Liang ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Transverse Mode ◽  
Phase Shifters ◽  
Design Parameters ◽  
Mode Operation ◽  
Mode Suppression ◽  
Acoustic Wave Resonators ◽  
Piston Mode

Abstract This paper discusses influence of displacement and patterning of phase shifters for piston mode operation of the temperature compensated (TC) surface acoustic wave (SAW) resonator on SiO2/LiNbO3 structure. As the phase shifters, Cu metals placed on the top surface of SiO2 are considered. First, the conventional Cu stripes are chosen, and their displacement are considered from IDT aperture edges. It is shown that achievable transverse mode suppression is almost identical when the stripe shape is adjusted for each case. Next, Cu dots are considered as patterned phase shifters. It is shown comparable transverse mode suppression is possible also for this case. However, relatively strong SAW lateral leakage occurs when they are placed above IDT fingers. These results indicate that location and pattern can be added as design parameters for the phase shifters on SiO2. It is favorable for further enhancement of total device performances.

Transverse mode suppression using rimmed unstable resonators

1972 ◽  
Vol 8 (6) ◽  
pp. 554-555 ◽  
Author(s):  
M. Lax ◽  
W. Louisell ◽  
C. Greninger ◽  
W. McKnight
Keyword(s):  
Transverse Mode ◽  
Mode Suppression ◽  
Unstable Resonators

scholarly journals High-power single-mode 894 nm VCSELs operating at high temperature (> 2 mW @ 365 K)

2022 ◽  
Vol 128 (1) ◽  
Author(s):  
Xue Ii ◽  
Yinli Zhou ◽  
Xing Zhang ◽  
Jianwei Zhang ◽  
Yugang Zeng ◽  
...  
Keyword(s):  
High Temperature ◽  
High Power ◽  
Surface Relief ◽  
Single Mode ◽  
Transverse Mode ◽  
Collaborative Optimization ◽  
Cavity Surface ◽  
Aperture Diameter ◽  
Mode Suppression ◽  
Oxide Aperture

AbstractIn this study, we realize the high-power output of a single-mode 894 nm vertical-cavity surface-emitting laser (VCSEL) at high temperature. The effects of the dimensional parameters of oxide aperture and surface relief on the transverse mode and threshold gain of VCSEL were analyzed. Through collaborative optimization of the oxide aperture and relief, the VCSEL with 8 µm oxide aperture diameter and 5 µm surface relief inner diameter can operate at high temperature of 365 K with single-mode output power of 2.02 mW and side-mode suppression of 29.2 dB.

Transverse energy confinement and resonance suppression in SAW resonators using low-cut lithium tantalate

2022 ◽  
Author(s):  
Yiwen He ◽  
Yu-Po Wong ◽  
Qi Liang ◽  
Ting Wu ◽  
Jing-Fu Bao ◽  
...  
Keyword(s):  
Transverse Energy ◽  
Transverse Mode ◽  
Lithium Tantalate ◽  
Wide Frequency Range ◽  
Energy Confinement ◽  
Scattering Loss ◽  
3 Dimensional ◽  
Mode Suppression ◽  
Dimensional Finite Element ◽  
Good Energy

Abstract This paper discusses the applicability of double busbar design to surface acoustic wave (SAW) devices employing low-cut lithium tantalate (LT) with multi-layered structure. This design offers good energy confinement, scattering loss suppression and transverse mode suppression for a wide frequency range. In addition, the effectiveness of manipulating the slowness curve shape for transverse mode suppression is demonstrated. First, three different lateral edge designs are applied to the layered SAW configuration on low-cut LT, and their performances are compared using the periodic 3-dimensional finite-element method powered by the hierarchical cascading technique. Then, the discussion is extended to influence of the SAW slowness shape to the transverse mode suppression.

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