Wafer-level substrate-free YIG single crystal film for a broadband tunable terahertz isolator

Xilai Zhang; Dan Zhao; Ding Zhang; Qiang Xue; Fei Fan; Yulong Liao; Qinghui Yang; Qiye Wen

doi:10.1364/PRJ.509876

Photonics Research, Volume. 12, Issue 3, 505(2024)

Wafer-level substrate-free YIG single crystal film for a broadband tunable terahertz isolator Editors' Pick

Xilai Zhang^1、†, Dan Zhao^2、†, Ding Zhang¹, Qiang Xue^1,3, Fei Fan^2,4, Yulong Liao¹, Qinghui Yang¹, and Qiye Wen^1,3、*

¹School of Electronic Science and Engineering, State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

²Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin 300350, China

³Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Shenzhen 518110, China

⁴e-mail: fanfei_gdz@126.com

show less

Figures & Tables(9)

Fig. 1. Schematic diagram. (a) Polarized THz-TDS system with an adjustable magnetic field. (b) THz wave transfer through the sample. (c) Magnetic Faraday rotation effect. (d) Device formed after packaging a sample.

Download full size

View in Article

Fig. 2. (a) Photograph of La:YIG sample. (b) SEM image. (c) XRD pattern of La:YIG and GGG film. (d) Hysteresis curve of a La:YIG sample.

Download full size

View in Article

$(a) Time domain THz pulses of air and La:YIG film on GGG substrate. (b) Effective refractive index of La:YIG. (c) Transmission and absorption coefficient of one sample under different EMFs. (d) Transmission and absorption coefficient of different numbers of samples (stacked together).$

Fig. 3. (a) Time domain THz pulses of air and La:YIG film on GGG substrate. (b) Effective refractive index of La:YIG. (c) Transmission and absorption coefficient of one sample under different EMFs. (d) Transmission and absorption coefficient of different numbers of samples (stacked together).

Download full size

View in Article

Fig. 4. (a), (b) Phase change of left-handed rotation and right-handed rotation of one La:YIG sample at different EMFs. (c) Faraday rotation angle spectra of one La:YIG sample under the EMF range from −0.22 to 0.22 T. (d) Verdet constant spectrum of La:YIG calculated from the polarization rotation angle at an EMF of 0.22 T.

Download full size

View in Article

Fig. 5. (a), (b) Phase change of left-handed rotation and right-handed rotation of different numbers of YIG samples (stacked together) under ±0.22 T. (c) Faraday rotation angle spectra of different numbers of YIG samples (stacked together) under ±0.22 T. (d) Faraday rotation angle changes with the number of sample stacks. (e), (f) Polarization states of the transmitted THz wave through one to four stacked La:YIG films at 0.6 THz under ±0.22 T.

Download full size

View in Article

Fig. 6. (a) ±45° LP time domain THz pulses of four stacked La:YIG films under the EMF of ±0.22 T. (b) −45° transmission under the EMF of ±0.22 T. (c) +45° transmission under the EMF of ±0.22 T. (d) Isolation of four stacked La:YIG films under the EMF of 0.22 T.

Download full size

View in Article

Fig. 7. (a), (b) Transmission of eight La:YIG samples (stacked together) with ±45° linearly polarized light. (c) Faraday rotation angle spectra of eight La:YIG samples (stacked together) under the EMF range from −0.26 to 0.26 T. (d) Isolation of eight stacked La:YIG films under the EMF range from 0 to 0.26 T. (e), (f) Polarization states of the transmitted THz wave through eight stacked La:YIG films at 0.6 THz from 0 to ±0.26 T. (g) Faraday rotation angle spectrum of eight La:YIG samples changes with magnetic field. (h) Isolation of eight stacked La:YIG films changes with magnetic field.

Download full size

View in Article

Table 1. Optimized Growth Parameters for La:YIG Films
View table
View in Article
Table 1. Optimized Growth Parameters for La:YIG Films
Flux Composition Temperature (°C) Growth Rate ( $μm \cdot \min^{- 1}$ ) Rotation Rate ( ${r \cdot \min}^{- 1}$ ) Growth Time (min) Thickness (μm)
${La}_{x} Y_{3 - x} {Fe}_{5} O_{12}$ $960 \pm 0.5$ 0.6 60 508 305

Table 2. Y, La, Fe, O Mole Fractions Obtained by EPMA from the Surface of La:YIG Sample (in %)
View table
View in Article
Table 2. Y, La, Fe, O Mole Fractions Obtained by EPMA from the Surface of La:YIG Sample (in %)
Position Y La Fe O Pb
1 14.6615 0.1710 16.9854 68.1821 0
2 14.6511 0.1648 17.0358 68.1483 0
3 13.9017 0.1639 14.5612 71.1767 0.1965
Average 14.4048 0.1666 16.2241 69.1690 0.0655

Tools

Get Citation

Copy Citation Text

Xilai Zhang, Dan Zhao, Ding Zhang, Qiang Xue, Fei Fan, Yulong Liao, Qinghui Yang, Qiye Wen, "Wafer-level substrate-free YIG single crystal film for a broadband tunable terahertz isolator," Photonics Res. 12, 505 (2024)

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites