Novel compact magnetless isolator based on a magneto-optical garnet material

Portela, Gianni; Levy, M.; Hernandez-Figueroa, Hugo E.

doi:10.1016/j.optlastec.2022.108638

Cited by 6 publications

(6 citation statements)

References 19 publications

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“…Additionally, an optical diode is another essential building block of PICs. Nonreciprocal optical diodes, typically called optical isolators, completely break the time-reversal symmetry [52] and achieve one-way transmission assisted by magneto-optical materials [53], non-magnetic structures undergoing spatiotemporal modulation [54], and nonlinearity [55]. However, optical isolators are limited in PICs due to the bulky layouts and huge fabrication challenges [56].…”

Section: Reciprocal Optical Diodementioning

confidence: 99%

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Zhu,

Deng,

Chen

et al. 2023

Photonics

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Three ultracompact integrated photonic devices are proposed, assisted by etched structures. A mode-order converter (MOC) is achieved with a footprint of 0.85 × 1.4 μm2, which exhibits high performances with insertion loss (IL) below 0.34 dB and mode purity (MP) above 90% within 100 nm waveband. Moreover, a mode blocking filter (MBF) is proposed based on a subwavelength grating with a footprint of 0.8 × 4.12 μm2, which allows the propagation of TM0 mode but blocks the TM1 mode with a remarkably high extinction ratio of 31.6 dB at the wavelength of 1550 nm. Finally, a compact reciprocal optical diode (ROD) is presented by cascading the abovementioned MOC and MBF with a footprint of 0.85 × 5.9 μm2. This ROD enables one-way transmissions for both TM0 mode and TM1 mode with contrast ratios of 19.74 dB and 32.04 dB, respectively. The design methodology paves a new way for mode manipulation in integrated multimode photonic circuits.

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Section: Reciprocal Optical Diodementioning

confidence: 99%

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Zhu,

Deng,

Chen

et al. 2023

Photonics

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“…The interaction of light and magnetic material structures allows manipulation by an external magnetic field [1][2][3][4], referred to as the magneto-optical effect, which has been widely investigated due to its superior performance in, but not limited to, biological sensing [5,6], optoisolation [7], and data * Authors to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Enhancement in the magneto-optical effect induced by combining multiple modes in a gold film–supported hybrid periodic gold/magnetic nanorod array

Du,

Zhang,

Liu

et al. 2024

J. Opt.

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In this study, the possibility of enhanced transverse magneto-optical Kerr effect (TMOKE) and performance monitoring of a hybrid nanostructure developed by sandwiching a ferromagnetic film within a gold layer and square periodic nanorod arrays, is theoretically investigated. Based on the findings, the TMOKE signal can be enhanced approximately 33 times when compared to the referenced planar film, which is elucidated by the hybrid of modes in the magnetic film region. In addition, a high level of environmental sensor performance is simultaneously achieved by recording the wavelength resonance positions with the variation of refractive index, which is compatible with gaseous medium from 1 to 1.01, indicating that the structure of the proposal will have applications in environmental monitoring.

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“…However, due to substantial lattice mismatch, additional dopants like Ho, Yb, and Gd are introduced to enhance lattice matching. The introduction of Yb and dopants not only diminishes the saturation magnetization intensity but also reduces material absorption, resulting in the development of MO materials with superior overall performance [24,29,30]. Among the techniques employed for obtaining thick RIG films of substantial size, liquid phase epitaxy (LPE) stands out as the most effective method.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Terahertz Magneto-Optical Effects in Wafer-Scale RIG Single Crystal Thick Films with Anti-Reflective Coatings for Improved Transmittance

Xue,

Zhang,

Yang

et al. 2024

Preprint

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Wafer-scale RIG single crystal thick films were fabricated on 3-inch GGG substrates using liquid phase epitaxy. The terahertz transmittance of the RIG crystals improved after removing the GGG substrate by polishing. The time-domain spectra at THz frequencies indicate the existence of a magneto-optical effect in RIG samples. The results indicate that the RIG samples exhibit a high refractive index of approximately 4.50 within the 0.1-1.0 terahertz frequency range, a transmittance of around 40%, and an absorption rate of only 10-50 cm-1. The Faraday rotation angles of the thick single-crystal films of the RIG samples were measured using a THz-TDS system. The RIG has a thickness of approximately 330 um. The Faraday rotation angles of RIG crystals at Terahertz frequencies can reach up to 16° when an external magnetic field of 0.18 T is applied. The Verdet constants of the RIG sample were calculated to be approximately 120°/mm/T. To improve the transmittance of the RIG sample, epoxy resin and TPX were used as anti-reflective films. The transmittance of the RIG sample increased by approximately 5% for the 80 um thick epoxy and about 10% for the 320 um thick TPX. Therefore, this RIG single crystal thick film can achieve a low loss, high transmittance, and a strong magneto-optical effect in the terahertz region with the cooperation of a reflection-reducing film. It is expected to have wide applications in terahertz magnetic polarization conversion, non-reciprocal phase shifters, and isolators.

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Novel compact magnetless isolator based on a magneto-optical garnet material

Cited by 6 publications

References 19 publications

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Enhancement in the magneto-optical effect induced by combining multiple modes in a gold film–supported hybrid periodic gold/magnetic nanorod array

Enhancing Terahertz Magneto-Optical Effects in Wafer-Scale RIG Single Crystal Thick Films with Anti-Reflective Coatings for Improved Transmittance

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