Gratings—general Properties of the Littrow Mounting and Energy Flow Distribution

Popov, Evgeny; Tsonev, L.; Maystre, D.

doi:10.1080/09500349014550421

Cited by 41 publications

(22 citation statements)

References 7 publications

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“…These peculiar patterns can actually be easily obtained considering only three plane waves with equal amplitudes interfering in freespace. Moreover, localized PSW on deep sinusoidal gratings have already shown such behavior [26]. Here, the pattern contains surely more than three waves, although that there are already three species ready to play the role -the incident wave, the wave reflected by the slab, and the scattered field, formed by the dipole radiation field and the PSW.…”

Section: Surface Scattered Field As a Plasmon Surface Wavementioning

confidence: 89%

Surface plasmon hurdles leading to a strongly localized giant field enhancement on two-dimensional (2D) metallic diffraction gratings

Brûlé¹,

Demésy²,

Gralak³

et al. 2015

Opt. Express

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An extensive numerical study of diffraction of a plane monochromatic wave by a single gold cone on a plane gold substrate and by a periodical array of such cones shows formation of curls in the map of the Poynting vector. They result from the interference between the incident wave, the wave reflected by the substrate, and the field scattered by the cone(s). In case of a single cone, when going away from its base along the surface, the main contribution in the scattered field is given by the plasmon surface wave (PSW) excited on the surface. As expected, it has a predominant direction of propagation, determined by the incident wave polarization. Two particular cones with height approximately 1/6 and 1/3 of the wavelength are studied in detail, as they present the strongest absorption and field enhancement when arranged in a periodic array. While the PSW excited by the smaller single cone shows an energy flux globally directed along the substrate surface, we show that curls of the Poynting vector generated with the larger cone touch the diopter surface. At this point, their direction is opposite to the energy flow of the PSW, which is then forced to jump over the vortex regions. Arranging the cones in a two-dimensional subwavelength periodic array (diffraction grating), supporting a specular reflected order only, resonantly strengthens the field intensity at the tip of cones and leads to a field intensity enhancement of the order of 10 000 with respect to the incident wave intensity. The enhanced field is strongly localized on the rounded top of the cones. It is accompanied by a total absorption of the incident light exhibiting large angular tolerances. This strongly localized giant field enhancement can be of much interest in many applications, including fluorescence spectroscopy, label-free biosensing, surface-enhanced Raman scattering (SERS), nonlinear optical effects and photovoltaics.

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Section: Surface Scattered Field As a Plasmon Surface Wavementioning

confidence: 89%

Surface plasmon hurdles leading to a strongly localized giant field enhancement on two-dimensional (2D) metallic diffraction gratings

Brûlé¹,

Demésy²,

Gralak³

et al. 2015

Opt. Express

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show abstract

“…Many fluence levels (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) were examined above and below the damage threshold for a given pulsewidth in order to establish the threshold value.…”

Section: ~1 2 4 mentioning

confidence: 99%

<title>Development of high damage threshold optics for petawatt-class short-pulse lasers</title>

et al. 1995

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“…One more phenomenon to note is the so-called optical vortex [19,24–26]. Equations (4) and (5) show that the Poynting vector becomes zero at the points whose coordinates satisfy…”

mentioning

confidence: 99%

Slow-light effect via Rayleigh anomaly and the effect of finite gratings

et al. 2015

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In this Letter, we investigate the slow-light effect of sub-wavelength diffraction gratings via the Rayleigh anomaly using a fully analytical approach without needing to consider specific grating structures. Our results show that the local group velocity of the transmitted light can be significantly reduced due to the optical vortex, which can inspire a new mechanism to enhance light–matter interactions for optical sensing and photodetection. However, the slow-light effect will diminish as the transmitted light propagates farther from the grating surface, and the slowdown factor decreases as the grating size shrinks.

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Gratings—general Properties of the Littrow Mounting and Energy Flow Distribution

Cited by 41 publications

References 7 publications

Surface plasmon hurdles leading to a strongly localized giant field enhancement on two-dimensional (2D) metallic diffraction gratings

Surface plasmon hurdles leading to a strongly localized giant field enhancement on two-dimensional (2D) metallic diffraction gratings

<title>Development of high damage threshold optics for petawatt-class short-pulse lasers</title>

Slow-light effect via Rayleigh anomaly and the effect of finite gratings

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