Voltage-actuated thermally tunable on-chip terahertz filters based on a whispering gallery mode resonator

Wang, Ziwei; Dong, Gaoneng; Yuan, Shixing; Liao, Can; Wu, Xiaojun; Zhang, Chi

doi:10.1364/ol.44.004670

Cited by 27 publications

(15 citation statements)

References 20 publications

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“…As mentioned before, the bandwidth of this isolator is limited by the bandwidth of the ring structure, therefore, this isolator should be tunable to fulfill the requirements of real-world applications. In the experiment, we modulated the central frequency of the isolator via employing an electrically driven thermal tuning method 35 , 41 , enabling the chip adjustability. Meanwhile, the magnetic field is utilized to introduce the nonreciprocal property of the chip.…”

Section: Resultsmentioning

confidence: 99%

“…In considerations of the parameters listed above, the isolator can be utilized in situations which can tolerate small bandwidths. In real-world applications, this chip can be applied in protecting tunable continuous-wave terahertz sources with narrow linewidths 10 , 45 , introducing functions as a filter or a temporal differentiator for processing terahertz signals with a modulating speed of megahertz level 35 , 36 , realizing applications for terahertz sensing such as detection of magnetic fields 46 .…”

Section: Discussionmentioning

confidence: 99%

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On-chip terahertz isolator with ultrahigh isolation ratios

et al. 2021

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Terahertz isolators, one of the typical nonreciprocal devices that can break Lorentz reciprocity, are indispensable building blocks in terahertz systems for their critical functionality of manipulating the terahertz flow. Here, we report an integrated terahertz isolator based on the magneto-optical effect of a nonreciprocal resonator. By optimizing the magneto-optical property and the loss of the resonator, we experimentally observe unidirectional propagation with an ultrahigh isolation ratio reaching up to 52 dB and an insertion loss around 7.5 dB at ~0.47 THz. With a thermal tuning method and periodic resonances, the isolator can operate at different central frequencies in the range of 0.405–0.495 THz. This on-chip terahertz isolator will not only inspire more solutions for integrated terahertz nonreciprocal devices, but also have the feasibility for practical applications such as terahertz sensing and reducing unnecessary reflections in terahertz systems.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

On-chip terahertz isolator with ultrahigh isolation ratios

et al. 2021

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“…Of course, this requires the microresonator's resonances to coincide with the desired gas absorption lines. The spectral position of the resonances is determined by the HRFZ-Si resonator's geometry and can subsequently be tuned, for example, by using thermal mechanisms [41,42]. Here, the 12 mm diameter disc shown in Figure 1a has an ultrahigh-Q resonance at 0.5561 THz at room temperature which is sufficiently close to the water vapour absorption line at 0.5569 THz (with a line width of about 6 GHz), and therefore no tuning was performed.…”

Section: Methodsmentioning

confidence: 99%

Terahertz Gas-Phase Spectroscopy Using a Sub-Wavelength Thick Ultrahigh-Q Microresonator

Vogt

Jones

Leonhardt

2020

Sensors

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The terahertz spectrum provides tremendous opportunities for broadband gas-phase spectroscopy, as numerous molecules exhibit strong fundamental resonances in the THz frequency range. However, cutting-edge THz gas-phase spectrometer require cumbersome multi-pass gas cells to reach sufficient sensitivity for trace level gas detection. Here, we report on the first demonstration of a THz gas-phase spectrometer using a sub-wavelength thick ultrahigh-Q THz disc microresonator. Leveraging the microresonator’s ultrahigh quality factor in excess of 120,000 as well as the intrinsically large evanescent field, allows for the implementation of a very compact spectrometer without the need for complex multi-pass gas cells. Water vapour concentrations as low as 4 parts per million at atmospheric conditions have been readily detected in proof-of-concept experiments.

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“…As shown in Figure 10 b, all-silicon THz cavities with Q as high as 2839 and 1020 have been realized [ 61 , 64 ]. Based on this, several tunable devices have been realized so far, such as thermal tuning of silicon THz whispering-gallery-mode resonators [ 152 , 153 ]. Antennas are vital for coupling guided waves in the THz silicon waveguides with free-space waves.…”

Section: Silicon Photonics For Thz Techniquesmentioning

confidence: 99%

A Review on Terahertz Technologies Accelerated by Silicon Photonics

Xie

Zhou

et al. 2021

Nanomaterials

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In the last couple of decades, terahertz (THz) technologies, which lie in the frequency gap between the infrared and microwaves, have been greatly enhanced and investigated due to possible opportunities in a plethora of THz applications, such as imaging, security, and wireless communications. Photonics has led the way to the generation, modulation, and detection of THz waves such as the photomixing technique. In tandem with these investigations, researchers have been exploring ways to use silicon photonics technologies for THz applications to leverage the cost-effective large-scale fabrication and integration opportunities that it would enable. Although silicon photonics has enabled the implementation of a large number of optical components for practical use, for THz integrated systems, we still face several challenges associated with high-quality hybrid silicon lasers, conversion efficiency, device integration, and fabrication. This paper provides an overview of recent progress in THz technologies based on silicon photonics or hybrid silicon photonics, including THz generation, detection, phase modulation, intensity modulation, and passive components. As silicon-based electronic and photonic circuits are further approaching THz frequencies, one single chip with electronics, photonics, and THz functions seems inevitable, resulting in the ultimate dream of a THz electronic–photonic integrated circuit.

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Voltage-actuated thermally tunable on-chip terahertz filters based on a whispering gallery mode resonator

Cited by 27 publications

References 20 publications

On-chip terahertz isolator with ultrahigh isolation ratios

On-chip terahertz isolator with ultrahigh isolation ratios

Terahertz Gas-Phase Spectroscopy Using a Sub-Wavelength Thick Ultrahigh-Q Microresonator

A Review on Terahertz Technologies Accelerated by Silicon Photonics

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