Selected Emerging THz Technologies

Damm, Christian; Schwefel, Harald G. L.; Sedlmeir, Florian; Hartnagel, H.L.; Preu, Sascha; Weickhmann, C.

doi:10.1002/9781118920411.ch8

“…where λ p = 2πc/ω p is the pump wavelength and G is the Raman or Brillouin gain. Here the oscillation threshold is proportional to the factor V p /Q p Q s just as for the hyper-parametric oscillations (51). It means that these three processes compete.…”

Section: Raman and Brillouin Scatteringmentioning

confidence: 96%

“…Similarly to the simple three-mode hyper-parametric oscillation, generation of Kerr frequency combs occurs above a certain power threshold. While expression (51) for the hyper-parametric oscillation threshold power P HP can be used as an estimate, the actual threshold value may also depend on the material group velocity dispersion (GVD) and thermorefractive properties, as well as on the excitation regime [102,394]. Two different excitation regimes can be realized.…”

Section: Cascaded Hyper-parametric Oscillation As Frequency Comb Gene...mentioning

confidence: 99%

Nonlinear and Quantum Optics with Whispering Gallery Resonators

Strekalov

¹

2015

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Optical whispering gallery modes (WGMs) derive their name from a famous acoustic phenomenon of guiding a wave by a curved boundary observed nearly a century ago. This phenomenon has a rather general nature, equally applicable to sound and all other waves. It enables resonators of unique properties attractive both in science and engineering. Very high quality factors of optical WGM resonators persisting in a wide wavelength range spanning from radio frequencies to ultraviolet light, their small mode volume, and tunable in-and out-coupling make them exceptionally efficient for nonlinear optical applications. Nonlinear optics facilitates interaction of photons with each other and with other physical systems, and is of prime importance in quantum optics. In this paper we review numerous applications of WGM resonators in nonlinear and quantum optics. We outline the current areas of interest, summarize progress, highlight difficulties, and discuss possible future development trends in these areas.

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“…where l p w = c 2 p p is the pump wavelength and G is the Raman or Brillouin gain. Here the oscillation threshold is proportional to the factor V Q Q p p s just as for the hyperparametric oscillations (51). It means that these three processes compete.…”

Section: Raman and Brillouin Scatteringmentioning

confidence: 95%

“…It means that a metallic antenna can be used to excite the WGMs [42]. For high radio frequency (RF) and THz radiation [51], the excitation can be realized using dielectric [52] or metal waveguides. Low order modes in the dielectric cavities are coupled to the free space and have significant radiative losses which allows applications of the structure as dielectric RF antennas [53].…”

Section: Historic Investigations Of Microwave Wgm Resonatorsmentioning

confidence: 99%

Nonlinear and quantum optics with whispering gallery resonators

Strekalov

¹

,

Marquardt

²

,

Matsko

³

et al. 2016

J. Opt.

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Optical whispering gallery modes (WGMs) derive their name from a famous acoustic phenomenon of guiding a wave by a curved boundary observed nearly a century ago. This phenomenon has a rather general nature, equally applicable to sound and all other waves. It enables resonators of unique properties attractive both in science and engineering. Very high quality factors of optical WGM resonators persisting in a wide wavelength range spanning from radio frequencies to ultraviolet light, their small mode volume, and tunable in-and out-coupling make them exceptionally efficient for nonlinear optical applications. Nonlinear optics facilitates interaction of photons with each other and with other physical systems, and is of prime importance in quantum optics. In this paper we review numerous applications of WGM resonators in nonlinear and quantum optics. We outline the current areas of interest, summarize progress, highlight difficulties, and discuss possible future development trends in these areas.

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Photonics-inspired terahertz whispering gallery mode resonator waveguide on silicon platform

Zhou

¹

,

Tu

²

,

Wu

³

et al. 2021

Applied Physics Letters

5

0

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Terahertz (THz) photonic waveguides are of great importance in THz integrated technology, especially for versatile signal processing. However, in THz photonics, very few fundamental “building blocks” equivalent to those used in muti-functional electronics circuits exist. This study proposes a photonics-inspired micro-ring whispering gallery mode resonator (WGMR) waveguide with a standard waveguide-compatible package on silicon platform. A gradual taper is integrated on the same chip to improve the coupling efficiency and reduce transmission loss. The packaged WGMR waveguide with an operating range of 0.360 to 0.440 THz had a maximum measured extinction ratio of 32 dB at 0.390 THz, with a Q factor of 385 and an insertion loss of 2.6 dB. The compact and standard waveguide-compatible packaged WGMR can easily be integrated into practical terahertz application systems for THz signal processing and as a tool for the study of fundamental THz science.

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Selected Emerging THz Technologies

Cited by 3 publications

References 110 publications

Nonlinear and Quantum Optics with Whispering Gallery Resonators

Nonlinear and Quantum Optics with Whispering Gallery Resonators

Nonlinear and quantum optics with whispering gallery resonators

Photonics-inspired terahertz whispering gallery mode resonator waveguide on silicon platform

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