Ultra-high Q terahertz whispering-gallery modes in a silicon resonator

  title={Ultra-high Q terahertz whispering-gallery modes in a silicon resonator},
  author={Dominik Walter Vogt and Rainer Leonhardt},
  journal={arXiv: Applied Physics},
We report on the first experimental demonstration of terahertz (THz) whispering-gallery modes (WGMs) with an ultra high quality (Q) factor of $1.5 \times {10}^{4}$ at 0.62THz. The WGMs are observed in a high resistivity float zone silicon (HRFZ-Si) spherical resonator coupled to a sub-wavelength silica waveguide. A detailed analysis of the coherent continuous wave (CW) THz spectroscopy measurements combined with a numerical model based on Mie-Debye-Aden-Kerker (MDAK) theory allows to… 

Figures and Tables from this paper

Prism coupling of high-Q terahertz whispering-gallery-modes over two octaves from 0.2 THz to 1.1 THz.

This work reports on prism coupling of high-quality (high-Q) terahertz whispering-gallery modes (WGMs) in spherical high resistivity float zone grown silicon (HRFZ-Si) resonators over two octaves from 0.2 THz to 1.1 THz, providing numerous opportunities for passive ultra-broadband high-Q devices operating in the THz frequency range.

On-chip single-mode high-Q terahertz whispering gallery mode resonator

The chip-scale terahertz (THz) devices and systems are helpful to enable actual applications in THz communication and sensing. Here, we demonstrate an on-chip THz whispering gallery mode resonator

Free-space coupling to symmetric high-Q terahertz whispering-gallery mode resonators.

The results convincingly underline the viability of free-space coupling in the THz frequency range and achieve very high excitation efficiencies up to 50% to THz WGMs with a Q-factor of 1.5×104 at 0.7 THz.

Subwavelength thick ultrahigh-Q terahertz disc microresonators

Artificial structures that exhibit narrow resonance features are key to a myriad of scientific advances and technologies. In particular, exploration of the terahertz (THz) spectrum—the final frontier

Whispering Gallery Modes at THz

Whispering gallery modes (WGM) offer strong confinement of electromagnetic radiation to specific resonances supported by the geometry of the resonator. In fact, highest ever quality factors are

Free-space coupling of terahertz whispering-gallery modes

We report on free-space coupling of high quality (Q) spherical THz whispering-gallery mode resonators (WGMRs) as a simple alternative to more complex waveguide and prism coupling. Excitation

Billion Q-factor in silicon WGM resonators

Optical whispering gallery mode (WGM) resonators allow combination of small mode volume with high Q-factor. Silicon is a major material for modern microelectronics and photonics. However, relatively

Optothermal dynamics in terahertz whispering-gallery resonators

Whispering gallery mode (WGM) resonators have been extensively studied in optical range, however, they still have great research potential in terahertz (THz) domain. In this paper, the electric-field

Terahertz-frequency temporal differentiator enabled by a high-Q resonator.

This investigation provides an effective approach for terahertz pulse re-shaping and real-time differential computing units.

Experimental observation of above billion quality factor in silicon crystalline optical whispering gallery mode resonators

Silicon is a widely used material in modern microelectronics and photonics. Extremely low optical losses in near and mid-IR wavelengths made it a promising material for whispering gallery mode (WGM)



Fano resonances in a high-Q terahertz whispering-gallery mode resonator coupled to a multi-mode waveguide.

To the best of the knowledge this is the highest Q factor ever reported for a THz WGM resonator coupled to a multi-mode waveguide in the terahertz (THz) frequency range.

Terahertz whispering gallery mode bubble resonator.

Whispering gallery mode (WGM) resonators are compelling optical devices, however they are nearly unexplored in the terahertz (THz) domain. In this letter, we report on THz WGMs in quartz glass bubble

High resolution terahertz spectroscopy of a whispering gallery mode bubble resonator using Hilbert analysis.

The experimental verification clearly demonstrates the significant advantages in relative frequency resolution and required acquisition time of the proposed method over the traditional data analysis.

Coupled whispering gallery mode resonators in the Terahertz frequency range.

By coupling two resonators of the same size, the coupling of two whispering gallery mode resonators in the Terahertz frequency range is reported, in very good agreement with the numerical calculations.

Optical microsphere resonators: optimal coupling to high-Q whispering-gallery modes

A general model is presented for coupling of high-Q whispering-gallery modes in optical microsphere resonators with coupler devices that possess a discrete and continuous spectrum of propagating

Whispering-gallery-mode cavity for terahertz pulses

We report an experimental and theoretical study of whispering-gallery-mode propagation of subpicosecond terahertz pulses in a dielectric cylinder coupled by means of a dielectric slab waveguide. We

Low-loss ultra-high-Q dark mode plasmonic Fano metamaterials.

These high-Q metamaterials can be used in ultrasensitive label-free terahertz sensing, dense photonic integration, and narrowband filtering and are experimentally demonstrated with an ultrahigh quality (Q) factor of 227.5.

High-Q terahertz microcavities in silicon photonic crystal slabs

Photonic crystal cavities consisting of three holes missing along a principal axis in a triangular lattice of holes in a silicon slab were fabricated. Each cavity was built into a waveguide to form a

Whispering gallery modes in a dielectric resonator: characterization at millimeter wavelength

Applications of whispering-gallery-mode (WGM) dielectric resonators in the millimeter and submillimeter frequency range are discussed. A summary of the main peculiarities of these resonators is

Spherical whispering‐gallery‐mode microresonators

Whispering‐gallery modes (WGM) on a spherical surface were first described by Lord Rayleigh at the beginning of the last century, but only after the invention of laser did they start to have some