Thermal tuning of silicon terahertz whispering-gallery mode resonators

Vogt, Dominik Walter; Jones, Angus Harvey; Leonhardt, R.

doi:10.1063/1.5036539

Cited by 23 publications

(18 citation statements)

References 21 publications

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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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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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“…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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“…We first consider a PCCW [36] implemented as a single-mode silicon waveguide with a periodic sequence of eight air holes along the direction of propagation. For simplicity, silicon with a refractive index of 3.416 is assumed to be lossless [29]. Figure 4(b) shows the gener- ated mock photocurrent of the PCCW, using the simulated frequency response function.…”

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confidence: 99%

Coherent Continuous Wave Terahertz Spectroscopy Using Hilbert Transform

Vogt

Erkintalo

Leonhardt

2019

J Infrared Milli Terahz Waves

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Coherent continuous wave (CW) terahertz spectroscopy is an extremely valuable technique that allows for the interrogation of systems that exhibit narrow resonances in the terahertz (THz) frequency range, such as high-quality (high-Q) THz whispering-gallery mode resonators. Unfortunately, common implementations are dramatically impaired by deficiencies in the used data analysis schemes.Here, we show that the physics of the problem presents an elegant solution whose full potential has remained overlooked until now. We argue that, thanks to the causality of physical systems, Hilbert transformation can be used to analyze the frequency response of linear systems with arbitrarily narrow resonance features in coherent CW THz spectroscopy. In particular, by establishing that signals encountered in typical experiments are closely related to analytic signals, we demonstrate that Hilbert transformation is applicable even when the envelope varies rapidly compared to the oscillation period.

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Thermal tuning of silicon terahertz whispering-gallery mode resonators

Cited by 23 publications

References 21 publications

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

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

A Review on Terahertz Technologies Accelerated by Silicon Photonics

Coherent Continuous Wave Terahertz Spectroscopy Using Hilbert Transform

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