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14. Maxwell's Equations and Electromagnetic Waves I

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Or, get it for Kobo Super Points! The book also focuses on the novel frontier of terahertz technology, which has been expanded by the impressive strides made in nanotechnology, and presents a comprehensive overview of the: - synthesis of various nanostructured materials; - study of their electrical and optical properties; - use of nano-sized elements and nanostructures as building blocks for devices; - design and fabrication of nanotechnology devices operating in the THz, IR and optical range.

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Overall rating No ratings yet 0. How to write a great review Do Say what you liked best and least Describe the author's style Explain the rating you gave Don't Use rude and profane language Include any personal information Mention spoilers or the book's price Recap the plot. Close Report a review At Kobo, we try to ensure that published reviews do not contain rude or profane language, spoilers, or any of our reviewer's personal information. To provide a high intensity of the THz emission, the number of quantized energies within the FWHM of the longitudinal phononic density of modes ought to be sufficiently large.

On the other hand, an average excited electron should not be scattered on its way towards the GNB boundary. On relaxation, the energy of the emitted THz photon would roughly match neglecting a much smaller energy of the microwave photon that of the LAVM. However, the resulting spectrum issued by the device would be limited by the transmission width of the band resonance filter see below in Fig. An outline of the THz radiation source based on a domestic microwave oven.

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Assuming the vector s to be the sum of p F and n vm q , the following relation holds: whence the angle that defines the propagation direction of the excited electron reads:. We emphasize that the electron with the given excitation energy will not exit the sample because the work function of gold is too high to overcome. Let us briefly discuss these possibilities. The cases ii and iii will be unfavored and hence rare by force of geometry considerations, in view of the nearly normal orientation of the momentum of the electron to the surface.

Note that this very process came about as the useful one in a different context, in our work on hyperthermia with the help of gold nanoparticles [ 1 ]. Putting it differently, the major peaks in the densities of modes of transversal and longitudinal phonons in gold and particularly in gold nanoparticles are well separated at ca. Credible numerical simulations comply quite well, even quantitatively, with such a neat separation of the vibration spectrum of gold into two peaks, in what concerns nanoparticles [ 9 ] as well as the bulk [ 10 ].

In order to reduce the probability of elastic scattering of the electron at the GNB boundary, and hence to enforce the decay probability into THz photon emission, one can try to enhance the electron density of states at the Fermi level.

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This can be achieved, e. The idea is that the doping of bulk gold with Ta or Fe atoms creates impurity d-levels in one of the spin channels, since the impurities are magnetic at the Fermi energy [ 11 ]. However, in consistency with the confinement conditions imposed on the nanoobject, i. The above estimates of the size of the nanoobjects Eq. However, these dimensions come into the foreground as we think over how to reduce the heating of nanoparticles by 2. For sizes as given in Eq. A substrate with multiple GNBs is placed into the oven chamber, where the GNBs are exposed to both direct irradiation from the magnetron and to that reflected from the chamber walls.

Effectively, the microwave photons could be absorbed anyway inside the GNBs, where consequently the THz photons will be emitted. The outcoming THz waves will be focused by a lens fabricated, e. Finally, two technical remarks are in place. Hence the situation is just at the border of the applicability region for the quasiparticle approximation; we use the latter out of practical convenience, keeping in mind the care to be taken.

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The second remark is that the above estimated dimensions of GNBs and GNRs are on the edge in yet another way, namely, their size is at the resolution limit for available lithographic techniques intrinsic resolution of the electron beam lithography [ 12 ] is 3—5 nm. A number of strategies exists to produce gold nanorods and nanowires of ca.

These strategies, possibly, could be tailored for making the GNBs on the substrate or embedded into a matrix transparent in the THz wavelength range. As for GNRs, Tseng et al. Hopefully, it could be tailored to provide the GNR sizes estimated here. On the basis of the principles outlined, a practical source of THz radiation might be hopefully created, which would find applications, e. The further studies of underlying physics may have impact on applications as well as on research of interactions of electrons with atomic vibrations and electromagnetic waves in nanoobjects.

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In quite recent works [ 17 — 18 ], a tunneling of acoustic phonons across nanoscale gaps became an issue of priority. Meanwhile, already in Beardsley et al. Thus, Riedinger et al. A working unit for quantum-information applications can be imagined in the spirit of a scheme described by Stannigel et al.

We suggest that gold nanobars and nanorings discussed in the present work may be plausible candidates for such applications as well. We thank Dr. Kresch for useful discussions of their measurements of the phonon spectrum in gold. National Center for Biotechnology Information , U.

Fundamental and Applied Nano-Electromagnetics

Journal List Beilstein J Nanotechnol v. Beilstein J Nanotechnol. Published online Jul 6. Kamil Moldosanov 1 and Andrei Postnikov 2. Anatolie S Sidorenko, Guest Editor. Author information Article notes Copyright and License information Disclaimer. Corresponding author. Kamil Moldosanov: ur. Received Jan 22; Accepted Jun Summary Background: The need for practical and adaptable terahertz sources is apparent in the areas of application such as early cancer diagnostics, nondestructive inspection of pharmaceutical tablets, visualization of concealed objects.

Keywords: longitudinal acoustic phonon, microwave photon, nanobar, nanoring, terahertz emitter. Open in a separate window. Figure 1. Figure 2. Figure 3.

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Figure 4. Acknowledgments We thank Dr. References 1.