Potential models of quarkonium

Быков, А. А.; Dremin, I.; Leonidov, A.

doi:10.1070/pu1984v027n05abeh004291

Cited by 47 publications

(29 citation statements)

References 60 publications

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“…Within the band gap, no light modes are allowed in the crystal due to multiple Bragg interference [8][9][10], hence the density of states (DOS) strictly vanishes. Since the local density of states also vanishes, the photonic band gap is a powerful tool to radically control spontaneous emission and cavity quantum electrodynamics (QED) of embedded quantum emitters [11][12][13][14]. Applications of 3D photonic band gap crystals range from dielectric reflectors for antennae [15] and for efficient photovoltaic cells [16][17][18], via white light-emitting diodes [19], to elaborate 3D waveguides [20] for 3D photonic integrated circuits [21], and to thresholdless miniature lasers [22] and devices to control quantum noise for quantum measurement, amplification, and information processing [14,23].…”

Section: Introductionmentioning

confidence: 99%

Experimental probe of a complete 3D photonic band gap

Adhikary¹,

Uppu²,

Harteveld³

et al. 2020

Opt. Express

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The identification of a complete three-dimensional (3D) photonic band gap in real crystals always employs theoretical or numerical models that invoke idealized crystal structures. Thus, this approach is prone to false positives (gap wrongly assigned) or false negatives (gap missed). Therefore, we propose a purely experimental probe of the 3D photonic band gap that pertains to many different classes of photonic materials. We study position and polarization-resolved reflectivity spectra of 3D inverse woodpile structures that consist of two perpendicular nanopore arrays etched in silicon. We observe intense reflectivity peaks (R > 90%) typical of high-quality crystals with broad stopbands. We track the stopband width versus pore radius, which agrees much better with the predicted 3D photonic band gap than with a directional stop gap on account of the large numerical aperture used. A parametric plot of s-polarized versus p-polarized stopband width agrees very well with the 3D band gap and is model-free. This practical probe provides fast feedback on the advanced nanofabrication needed for 3D photonic crystals and stimulates practical applications of band gaps in 3D silicon nanophotonics and photonic integrated circuits, photovoltaics, cavity QED, and quantum information processing. arXiv:1909.01899v2 [physics.optics]

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Section: Introductionmentioning

confidence: 99%

Experimental probe of a complete 3D photonic band gap

Adhikary¹,

Uppu²,

Harteveld³

et al. 2020

Opt. Express

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“…Photonic band gap materials possess great potential to drastically change the rate of spontaneous emission and to achieve localization of light. [3][4][5] Control over spontaneous emission is important for many applications, such as miniature lasers, [6] light-emitting diodes, [7] and solar cells. [8,9] Different types of 3D photonic crystals have been conceived.…”

Section: Introductionmentioning

confidence: 99%

Inverse‐Woodpile Photonic Band Gap Crystals with a Cubic Diamond‐like Structure Made from Single‐Crystalline Silicon

Broek

Woldering

Tjerkstra

et al. 2011

Adv Funct Materials

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Three dimensional photonic band gap crystals with a cubic diamond-like symmetry are fabricated. These so-called inverse-woodpile nanostructures consist of two perpendicular sets of pores in single-crystal silicon wafers and are made by means of complementary metal oxide-semiconductor (CMOS)-compatible methods. Both sets of pores have high aspect ratios and are made by deep reactive-ion etching. The mask for the first set of pores is defined in chromium by means of deep UV scan-and-step technology. The mask for the second set of pores is patterned using an ion beam and carefully placed at an angle of 90° with an alignment precision of better than 30 nm. Crystals are made with pore radii between 135-186 nm with lattice parameters a = 686 and c = 488 nm such that a/c = √2; hence the structure is cubic. The crystals are characterized using scanning electron microscopy and X-ray diffraction. By milling away slices of crystal, the pores are analyzed in detail in both directions regarding depth, radius, tapering, shape, and alignment. Using optical reflectivity it is demonstrated that the crystals have broad reflectivity peaks in the near-infrared frequency range, which includes the telecommunication range. The strong reflectivity confirms the high quality of the photonic crystals. Furthermore the width of the reflectivity peaks agrees well with gaps in calculated photonic band structures.

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“…There are various theories of cosmic ray origin that may explain the γ-ray line observations; in particular, the works of Bykov et al (Bykov and Toptygin 1990;Bykov and Toptygin 1992;Bykov and Fleishman 1992;Bykov and Bloemen 1994), who argue for acceleration by a collection of shock waves. In the theory of cosmic ray origin proposed by Biermann et al(Biermann 1993;Biermann and Cassinelli 1993;Stanev et al1993;Rachen et al1993), one important argument is the acceleration of cosmic ray nuclei in SN-shocks that go through stellar winds.…”

Section: Bloemenmentioning

confidence: 99%

Gamma-line radiation from stellar winds in the Orion complex: a test for the theory of cosmic ray origin

Nath

Biermann

1994

Monthly Notices of the Royal Astronomical Society

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We consider γ-ray emission from heavy nuclei that are accelerated in the shocks of stellar winds and are excited in interactions with the ambient matter in the Orion complex.We show that the recent detection of γ-ray lines in the Orion complex by COMPTEL telescope can be explained by such a scenario, assuming cosmic abundances. The scenario is consistent with recent models of cosmic ray acceleration in stellar winds of massive stars.

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Potential models of quarkonium

Cited by 47 publications

References 60 publications

Experimental probe of a complete 3D photonic band gap

Experimental probe of a complete 3D photonic band gap

Inverse‐Woodpile Photonic Band Gap Crystals with a Cubic Diamond‐like Structure Made from Single‐Crystalline Silicon

Gamma-line radiation from stellar winds in the Orion complex: a test for the theory of cosmic ray origin

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