The analytical basis for the resonances and anti-resonances of loop antennas and meta-material ring resonators

McKinley, Arnold; White, Thomas P.; Maksymov, Ivan S.; Catchpole, Kylie

doi:10.1063/1.4764104

Cited by 39 publications

(53 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to a resonance, the most important signature of an anti-resonance is a π phase jump accompanied by a pronounced low magnitude in transmission. Similar to resonances, anti-resonances widely exist in nearly all kinds of dynamic systems from mechanical oscillators [41,42] to electrodynamic [43][44][45][46][47] and quantum systems [48][49][50][51]. Generally, the anti-resonance arises from destructive interference between the excitation and response of the system, which is different from the constructive interference during resonance.…”

Section: The Physics Of An Anti-resonancementioning

confidence: 99%

“…Phenomenologically, anti-resonance in the transmission spectrum of a given microwave cavity can be treated as an equivalent parallel RLC circuit [45], which effectively blocks the incident signal at the resonant frequency due to its high impedance [45,46]. For cavity resonance in the transmission spectrum, closed boundaries defined by discontinuous interfaces, such as the metallic walls of cavity, determine the resonant behavior.…”

Section: Input-output Formalism For a Cavity Anti-resonancementioning

confidence: 99%

See 1 more Smart Citation

Level attraction and level repulsion of magnon coupled with a cavity anti-resonance

Rao

Zhao

et al. 2019

New J. Phys.

View full text Add to dashboard Cite

We report on coherent and dissipative coupling between a magnon mode and an anti-resonance of transmission in a cylindrical microwave cavity. By effectively suppressing coherent coupling, we observe the hybridized dispersion to change from level repulsion to level attraction. A careful examination reveals distinct differences in the line shape and phase evolution of transmission spectra between these coupling behaviors. For a quantitative understanding of the interactions between the magnon mode and the cavity anti-resonance, we develop a model which precisely describes our experimental observations, particularly, the signature in the line shape and phase of the microwave transmission. Our work sets a foundation for understanding strong coupling between magnon modes and cavity anti-resonances. In addition, it also confirms the ubiquity of level attraction in coupled magnon-photon systems, which may be helpful to develop future magnon-based hybrid quantum systems.

show abstract

Section: The Physics Of An Anti-resonancementioning

confidence: 99%

Section: Input-output Formalism For a Cavity Anti-resonancementioning

confidence: 99%

Level attraction and level repulsion of magnon coupled with a cavity anti-resonance

Rao

Zhao

et al. 2019

New J. Phys.

View full text Add to dashboard Cite

show abstract

“…This is an extension of an earlier work, which formulated the input impedance in the RF region as a RLC circuit representation. 30 In that work, we showed that the results also extended to the high GHz regime. In order to extend the RLC model to the NIR and OR, we derive additional terms, so that the modal RLC elements of circular loops, constructed of metals, dielectrics, or semi-conductors can now be calculated at any wavelength from the RF through the OR.…”

Section: Introductionmentioning

confidence: 69%

“…An analytic form for its input impedance has been known since the mid-1950s. 31,32 In a recent paper, 30 we derived a simplified form by recasting the formulation as a RLC model. We showed that the loop looks like an infinite set of series resonant circuits in parallel…”

Section: A Review Of Closed Loop Theory At Low Frequenciesmentioning

confidence: 99%

Theory of the circular closed loop antenna in the terahertz, infrared, and optical regions

McKinley

White

Catchpole

2013

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

Modern antenna theory forms the bulwark of our knowledge of how radiation and metallic structures interact in the radio frequency (RF) and microwave (MW) regions. The theory has not yet penetrated the terahertz, infrared, and optical regions to the same degree. In this paper, we provide a rigorous analysis of closed circular loop antennas from first principles. Using antenna theory, we tie together their long wavelength behavior with their behavior at short wavelengths through the visible region. We provide analytic forms for the input impedance, current, quality factor, radiation resistance, ohmic loss, and radiation efficiency. We provide an exact circuit model for the closed loop in the RF and MW regions, and extend it through the optical region. We also provide an implicit analytic form for the determination of all modal resonances, allowing prediction of the resonance saturation wavelength for loops. Through simulations, we find that this behavior extends to hexagonal and square loops. All results are applicable to loop circumferences as short as 350 nm. Finally, we provide a precise analytic model of the index of refraction, as a tool in these computations, which works equally well for metals and semi-conductors. V C 2013 AIP Publishing LLC. [http://dx.

show abstract

“…This makes them inappropriate for communication on a single frequency, as needed in the RF. In fact, a detailed, analytical, circuit model of the large loop was not developed until 2012 [2].…”

Section: Introductionmentioning

confidence: 99%

Designing Nano-loop antenna arrays for light-trapping in solar cells

McKinley

White

Catchpole

2013

2013 IEEE 39th Photovoltaic Specialists Conference (PVSC)

View full text Add to dashboard Cite

Many types of wavelength-scale optical structures have been investigated for light trapping in solar cells. Nanoloops have not yet been studied on solar cells, even though they play a central role in arrays for meta-materials in the microwave (MW) region. In this paper, we use standard antenna theory to provide a rigorous analysis of closed circular metallic loops as antennas in the infrared (IR) and optical region (OR), the regions of solar activity. We provide an exact impedance model for closed loops and an approximate RLC model from which we determine key design factors (resonances, quality factors and radiation efficiencies). Using numerical simulations, we find that these results extend to hexagons and to squares. The principle differences between loops in the radio frequency region (RF) and in the IR/OR are due to dispersion in the loop material. This causes a scaling such that resonances eventually reach saturation; that is, closed loops made of the noble metals will not have their first fundamental resonance at frequencies above the IR. Closed loops, though, do have strong higher harmonic resonances with quality factors on the order of 2 to 5, and these can appear in the OR depending on the loop circumference. Such higher order resonances may be promising for light trapping in solar cells.

show abstract

The analytical basis for the resonances and anti-resonances of loop antennas and meta-material ring resonators

Abstract: Alfvén eigenmodes excitation by external loop antennas in the Compact Helical System heliotron/torsatron Rev. Sci. Instrum. 72, 405 (2001);

Cited by 39 publications

References 29 publications

Level attraction and level repulsion of magnon coupled with a cavity anti-resonance

Level attraction and level repulsion of magnon coupled with a cavity anti-resonance

Theory of the circular closed loop antenna in the terahertz, infrared, and optical regions

Designing Nano-loop antenna arrays for light-trapping in solar cells

Contact Info

Product

Resources

About