

FOLLOWUS
1. a College of Chemical Engineering and Material Sciences Zhejiang University of Technology
2. b Department of Applied Physics Zhejiang University of Technology
Online First:23 March 2021,
Published:2021
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Chengke Chen, Zhi He, Ancha Xu, et al. Design and optimization of diamond mid-infrared phase shifter[J]. Functional Diamond2021, 1(1): 117-124.
Chengke Chen, Zhi He, Ancha Xu, et al. Design and optimization of diamond mid-infrared phase shifter[J]. Functional Diamond2021, 1(1): 117-124. DOI: 10.1080/26941112.2020.1869485.
Herein
the mid-infrared (7.7–13.7 μm) diamond-based phase shifter was designed and optimized by finite-element analysis. The ridge-shaped diamond waveguide is designed and doped to form the internal p–n structure
and the internal carrier distribution is changed by applying forward and reverse voltages to change the effective refractive index to achieve the effect of π-phase shift. The results show that when p-doping concentration is 4 × 10
17
cm
−3
and n doping concentration is 1 × 10
18
cm
−3
upon the reverse voltage (8 V) is applied
the change of the real part of effective refractive index (ΔR) is 1.6 × 10
−5
and the length of the phase shifter (L) required to realize the π-phase shift is 241 mm; upon the forward voltage (–8 V) is applied
ΔR increases to 3.2 × 10
−4
and the length of the phase shifter required is shortened to 12.03 mm. Such a short length is relatively easy in industrial production. In order to make the refractive index distribution more uniform
the carrier concentration has been optimized as 1 × 10
17
cm
−3
for p-type and 4 × 10
17
cm
−3
for n-type
respectively.
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