On the guided propagation of electromagnetic wave beams

Goubau, G.; Schwering, F.

doi:10.1109/tap.1961.1144999

Cited by 346 publications

(74 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The process of converting sunlight into high frequency microwaves and transmitting them into the earth is also used [4]. The power of microwaves can also be efficiently transferred using lenses and reflection mirrors [5][6]. A major problem of this method is the conversion of power into usable power by the antennas.…”

Section: Introductionmentioning

confidence: 99%

A Review of Contactless Electrical Power Transfer: Applications, Challenges and Future Trends

Hasanzadeh

Vaez‐Zadeh

2015

Automatika

View full text Add to dashboard Cite

Original scientific paperMethods of contactless electrical power transfer technologies have been surveyed and results are presented here. In this among, the inductive based contactless electrical power transfer systems are investigated in more detail. The principles, structures and operations of the systems as well as their methods presented in the literature are reviewed and their applications are explored. Also, current challenges and opportunities and future trends are noted. An effective index is proposed to compare different contactless power transfer systems describing their present statuses and the future trends. Finally, some remarks and recommendations regarding future studies are proposed.Key words: Contactless Electrical Power Transfer, Inductive Power Transfer, Resonant Circuits, Wireless Power TransferPregled stanja u području bezkontaktnog prijenosa električne energije: primjene, izazovi i trendovi. U radu je dan prikaz različitih tehnologija u području bezkontaktnog prijenosa električne energije. U radu je naglasak na indukcijom baziranim sustavima bezkontaktnog prijenosa električne energije. Pregledom literature utvrðeni su koncepti, strukture i način rada pojedinih sustava bezkonaktnog prijenosa kao i njihove primjene. Također, zabilježeni su trenutni izazovi, prilike i trendovi. Predložen je efektivni indeks za vrednovanje sustava bezkontaktnog prijenosa električne energije s ciljem komparativne analize različitih sustava opisanih trenutnim statusom i trendovima. Konačno, dan je kritički osvrt i predložene su preporuke za buduće studije.Ključne riječi: bezkontaktni prijenos električne energije, indukcijom bazirani prijenos energije, rezonantni krugovi, bežični prijenos električne energije

show abstract

Section: Introductionmentioning

confidence: 99%

A Review of Contactless Electrical Power Transfer: Applications, Challenges and Future Trends

Hasanzadeh

Vaez‐Zadeh

2015

Automatika

View full text Add to dashboard Cite

show abstract

“…[4][5][6]) for which the structure of the electromagnetic field and the energy concentration after successive diffractions is considered, and the possibility of reaching a steady state and the evolution of the degree of coherence is analysed.…”

Section: Introductionmentioning

confidence: 99%

Cascaded Phase Fourier Holograms

Slaby

Szoplik

Chałasińska-Macukow

1983

Optica Acta: International Journal of Optics

View full text Add to dashboard Cite

“…1) by constructing a low-loss Bloch wave in a matched periodic structure where the optical field synthesizes periodic focii that jump across gaps and avoid diffraction loss and scattering at the crossing points. This concept is reminiscent of periodic lens-array microwave beam guiding [15]. Microphotonic implementations use a minimum of modes to implement focusing physics, eliminate reflections, and introduce new degrees of freedom.…”

mentioning

confidence: 99%

Ultra-low-loss CMOS-compatible waveguide crossing arrays based on multimode Bloch waves and imaginary coupling

et al. 2014

View full text Add to dashboard Cite

We experimentally demonstrate broadband waveguide crossing arrays showing ultra low loss down to 0.04 dB/crossing (0.9%), matching theory, and crosstalk suppression over 35 dB, in a CMOS-compatible geometry. The principle of operation is the tailored excitation of a low-loss spatial Bloch wave formed by matching the periodicity of the crossing array to the difference in propagation constants of the 1 st -and 3 rd -order TE-like modes of a multimode silicon waveguide. Radiative scattering at the crossing points acts like a periodic imaginary-permittivity perturbation that couples two supermodes, which results in imaginary (radiative) propagation-constant splitting and gives rise to a low-loss, unidirectional breathing Bloch wave. This type of crossing array provides a robust implementation of a key component enabling dense photonic integration. Silicon photonics is beginning to enable complex on-chip optical networks comprising hundreds of devices. One emerging application is energy efficient, chip-scale photonic interconnects for CPU-to-memory communication [1]. With increasing device density and complexity in a planar photonic circuit, efficient waveguide crossings are indispensible in many network topologies [1]. Crossing designs based on adiabatic aperture widening are large and relatively lossy (0.3-1 dB) [2-4], while resonant designs permit low loss and crosstalk in a compact footprint, but have narrow bandwidth [5] (e.g. ∼ 4 nm [6]). Multilayer processes allow reduced scattering in crossing waveguides [7] or their complete isolation through vertical displacement [8], but they require multiple lithographic steps and/or material layers. Multimode-interference (MMI) based crossings [9][10][11][12][13][14], despite ostensibly multimode behavior, have a number of attractive features, with individual crossings down to 0.18 dB loss and 41 dB crosstalk [14].In this Letter, we describe ultra-low-loss waveguide crossing arrays based on a periodic multimode structure. Popović et al. [12] proposed an efficient approach to design a crossing array (Fig. 1) by constructing a low-loss Bloch wave in a matched periodic structure where the optical field synthesizes periodic focii that jump across gaps and avoid diffraction loss and scattering at the crossing points. This concept is reminiscent of periodic lens-array microwave beam guiding [15]. Microphotonic implementations use a minimum of modes to implement focusing physics, eliminate reflections, and introduce new degrees of freedom. In the first experimental demonstration of this concept [16], we showed record low waveguide-crossing loss of 0.04 dB/crossing (0.9%), equal to theoretical design efficiency [12]. Another recent paper [17] demonstrated similar crossing arrays based on our proposal in Ref. 12, achieving 0.14 dB loss, and introduced an improvement based on subwavelength patterning of the sidewalls, reducing the loss further to below 0.02 dB. To our knowledge, these two results represent respectively the lowest achieved crossing loss in CMOS-compatible photolith...

show abstract

On the guided propagation of electromagnetic wave beams

Cited by 346 publications

References 1 publication

A Review of Contactless Electrical Power Transfer: Applications, Challenges and Future Trends

A Review of Contactless Electrical Power Transfer: Applications, Challenges and Future Trends

Cascaded Phase Fourier Holograms

Ultra-low-loss CMOS-compatible waveguide crossing arrays based on multimode Bloch waves and imaginary coupling

Contact Info

Product

Resources

About