Developing Uncertainty Quantification Strategies in Electromagnetic Problems Involving Highly Resonant Cavities

Abstract High-quality factor resonant cavities are challenging structures to model in electromagnetics owing to their large sensitivity to minute parameter changes. Therefore, uncertainty quantification strategies are pivotal to understanding key parameters affecting the cavity response. We discuss here some of these strategies focusing on shielding effectiveness properties of a canonical slotted cylindrical cavity that will be used to develop credibility evidence in support of predictions made using computational simulations for this application.

Download Full-text

Extraordinary Coherent Thermal Emission From SiC Due to Coupled Resonant Cavities

Journal of Heat Transfer ◽

10.1115/1.2955475 ◽

2008 ◽

Vol 130 (11) ◽

Cited By ~ 36

Author(s):

Nir Dahan ◽

Avi Niv ◽

Gabriel Biener ◽

Yuri Gorodetski ◽

Vladimir Kleiner ◽

...

Keyword(s):

Quality Factor ◽

Coherence Length ◽

Thermal Emission ◽

Spatial Coherence ◽

Optical Filters ◽

High Quality Factor ◽

Experimental Results ◽

Thermal Source ◽

High Quality ◽

Resonant Cavities

In high temperature and vacuum applications, when heat transfer is predominantly by radiation, the material’s surface texture is of substantial importance. Several micro- and nanostructure designs have been proposed to enhance a material’s emissivity and its radiative coherence, as control of thermal emission is of crucial concern in the design of infrared sources, optical filters, and sensing devices. In this research, an extraordinary coherent thermal emission from an anisotropic microstructure is experimentally and theoretically presented. The enhanced coherency is due to coherent coupling between resonant cavities obtained by surface standing waves, wherein each cavity supports a localized field that is attributed to coupled surface phonon polaritons. We show that it is possible to obtain a polarized quasimonochromatic thermal source from a SiC microstructure with a high quality factor of 600 at the resonant frequency of the cavity and a spatial coherence length of 716 wavelengths, which corresponds to an angular divergence of 1.4mrad. In the experimental results, we measured a quality factor of 200 and a spatial coherence length of 143 wavelengths. We attribute the deviation in the experimental results to imperfections in the fabrication of the high quality factor cavities.

Download Full-text

Design of Photonic Crystal-Based Demultiplexer with High-Quality Factor for DWDM Applications

Journal of Optical Communications ◽

10.1515/joc-2017-0058 ◽

2019 ◽

Vol 40 (2) ◽

pp. 135-138 ◽

Cited By ~ 3

Author(s):

Mahdi Zavvari

Keyword(s):

Photonic Crystal ◽

Quality Factor ◽

Transmission Efficiency ◽

High Quality Factor ◽

Selection Task ◽

Wavelength Selection ◽

High Quality ◽

Channel Spacing ◽

Resonant Cavities

Abstract In this article, we proposed a four-channel optical demultiplexer based on photonic crystal resonant cavities. For performing wavelength selection task, we used four resonant cavities with different lengths in order to choose four channels with different wavelengths. The average channel spacing of the structure is about 1 nm and the minimum transmission efficiency is 90 %. The bandwidths of the channels are the same and equal to 0.8 nm.

Download Full-text

A Long Bar Type Silicon Resonator with a High Quality Factor

IEEJ Transactions on Sensors and Micromachines ◽

10.1541/ieejsmas.134.26 ◽

2014 ◽

Vol 134 (2) ◽

pp. 26-31 ◽

Cited By ~ 13

Author(s):

Nguyen Van Toan ◽

Masaya Toda ◽

Yusuke Kawai ◽

Takahito Ono

Keyword(s):

Quality Factor ◽

High Quality Factor ◽

High Quality ◽

Type Silicon ◽

Silicon Resonator

Download Full-text

Coherent suppression of backscattering in optical microresonators

Light Science & Applications ◽

10.1038/s41377-020-00440-2 ◽

2020 ◽

Vol 9 (1) ◽

Author(s):

Andreas Ø. Svela ◽

Jonathan M. Silver ◽

Leonardo Del Bino ◽

Shuangyou Zhang ◽

Michael T. M. Woodley ◽

...

Keyword(s):

Quality Factor ◽

Bulk Material ◽

Near Field ◽

High Quality Factor ◽

Dual Frequency ◽

High Quality ◽

Frequency Combs ◽

Optical Microresonators ◽

Whispering Gallery ◽

The Stability

AbstractAs light propagates along a waveguide, a fraction of the field can be reflected by Rayleigh scatterers. In high-quality-factor whispering-gallery-mode microresonators, this intrinsic backscattering is primarily caused by either surface or bulk material imperfections. For several types of microresonator-based experiments and applications, minimal backscattering in the cavity is of critical importance, and thus, the ability to suppress backscattering is essential. We demonstrate that the introduction of an additional scatterer into the near field of a high-quality-factor microresonator can coherently suppress the amount of backscattering in the microresonator by more than 30 dB. The method relies on controlling the scatterer position such that the intrinsic and scatterer-induced backpropagating fields destructively interfere. This technique is useful in microresonator applications where backscattering is currently limiting the performance of devices, such as ring-laser gyroscopes and dual frequency combs, which both suffer from injection locking. Moreover, these findings are of interest for integrated photonic circuits in which back reflections could negatively impact the stability of laser sources or other components.

Download Full-text