On the phase of plasmons excited by slits in a metal film

Janssen, O.T.A.; Urbach, H. P.; Hooft, G. W. ’t

doi:10.1364/oe.14.011823

Cited by 59 publications

(44 citation statements)

References 19 publications

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“…[6], the E x of the scattered field is found to be excited =2 out of phase with the E x of the incident field. This agrees with the phase found by us for the magnetic field [12]. Lezec and Thio proposed that the optimal distance is b 0:75a, because then the E x field constructively interferes at the slit entrance with the incident field.…”

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confidence: 91%

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Giant Optical Transmission of a Subwavelength Slit Optimized Using the Magnetic Field Phase

2007

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In this Letter, we show that the energy equivalent to that incident on a 4:7 m wide strip can be squeezed through a 50 nm wide slit in a metal film surrounded by grooves. This corresponds to a transmission efficiency of 9400%, which can be even further enhanced by increasing the number of grooves. We use the phase of the magnetic field to explain that the ideal slit-to-groove distance is just over half the plasmon wavelength. In addition, we also optimize the groove depth and width. Such optimized transmission enhancement is very important for near-field devices.

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confidence: 91%

“…4, for an optical periodic groove structure with a groove depth of 70 nm and a duty cycle of 0.56. We therefore expect constructive interference and maximum transmission of the slit with the same groove structure at a distance that is 7% larger than half the plasmon wavelength [12], hence b 0:54a. This agrees well with the computed results illustrated in Fig.…”

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confidence: 97%

Giant Optical Transmission of a Subwavelength Slit Optimized Using the Magnetic Field Phase

2007

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“…This raises the question of how the SPPs are actually generated. Recently it has been shown experimentally that a single subwavelength slit or groove in a Ag film could act as an efficient source of SPPs on the flat surfaces surrounding both the input and exit apertures, at various wavelengths [16][17][18]21]. It has also been experimentally inferred that a single cylindrical subwavelength hole in a Ag could efficiently launch an SPP on its exit side [22].…”

Section: Do Transmission Maxima Results From Grating Coupling To Spps?mentioning

confidence: 99%

Universal optical transmission features in periodic and quasiperiodic hole arrays

Pacifici¹,

Lezec²,

Sweatlock³

et al. 2008

Opt. Express

132

123

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Abstract:We investigate the influence of array order in the optical transmission properties of subwavelength hole arrays, by comparing the experimental spectral transmittance of periodic and quasiperiodic hole arrays as a function of frequency. We find that periodicity and long-range order are not necessary requirements for obtaining enhanced and suppressed optical transmission, provided short-range order is maintained. Transmission maxima and minima are shown to result, respectively, from constructive and destructive interference at each hole, between the light incident upon and exiting from a given hole, and surface plasmon polaritons (SPPs) arriving from individual neighboring holes. These SPPs are launched along both illuminated and exit surfaces, by diffraction of the incident and emerging light at the neighboring individual subwavelength holes. By characterizing the optical transmission of a pair of subwavelength holes as a function of hole-hole distance, we demonstrate that a subwavelength hole can launch SPPs with an efficiency up to 35%, and with an experimentally determined launch phase ϕ = π /2, for both inputside and exit-side SPPs. This characteristic phase has a crucial influence on the shape of the transmission spectra, determining transmission minima in periodic arrays at those frequencies where grating coupling arguments would instead predict maxima.

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“…Δ ϕ 1 and (Δ ϕ 2 − Δ ϕ 3 ), respectively. It should be noted that processes ② and ③ were completely ignored in a previous theoretical work 23 , which is an inaccurate assumption as shown by the dispersion of modeled Δ ϕ 2 (blue line) and Δ ϕ 3 (green line) in the inset of Fig. 3(b).…”

Section: Microscopic Understanding Of Intrinsic Phase Dispersionmentioning

confidence: 96%

Phase change dispersion of plasmonic nano-objects

Zeng

Gao³

et al. 2015

Cleo: 2015

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Phase is an inherent and important feature for coherent processes, which, unfortunately, has not been completely understood for surface plasmon polariton (SPP) and matter interactions. Here we propose a practical approach to extract the phase change dispersion during the interaction between free-space light, SPPs and nanogroove/slit based on far-field information only. Numerical simulation and experimental validation were both presented using nanoslit-groove plasmonic interferometers, agreeing well with theoretical near-field analysis. This approach is generally feasible to extract the intrinsic phase dispersion of other plasmonic nanostructures and can reveal more fundamental features of SPP-matter interactions.The investigation on light interaction with individual slits has a long history in physical optics, resulting in many fundamental progresses (e.g. wave-particle duality). In recent years, there has been considerable growth in plasmonics research due to their subwavelength confinement of electromagnetic (EM) waves 1 . To better understand surface plasmon polariton (SPP) mediated interactions between optical nano-objects at metallodielectric interfaces, researchers have performed numerous theoretical and experimental studies of the physics of simple nanostructures, e.g., single or double slits [2][3][4] , grooves [5][6][7][8][9] , or apertures [10][11][12][13] . But even for the simplest single slit-groove structure, some initial debate arose regarding the physical mechanisms underlying these interactions [14][15][16][17] . Therefore, there are still many open questions regarding fundamental understanding on SPP waves.Phase is an inherent and important feature for coherent processes, particularly for EM waves (e.g. high resolution imaging 18 , quantum optics 19 , etc.). As reported in a double slit SPP interference experiment 20 , the phase information is essential to interpret the spatial interference pattern of SPP waves, reflecting the plasmonic wave-particle duality of quantum mechanics 21 . In recent years, we have witnessed a rapid growth of plasmonics investigation involving the study of the intrinsic properties of SPP waves (including phase information 17,[22][23][24] ) and their interaction with matter at nanoscales 25 . For instance, during the interaction between light and subwavelength slits/grooves, those slits/grooves were considered as oscillating dipole sources and the excited SPPs were claimed to have a π intrinsic phase shift introduced by the process of charge accumulation at these simplified dipoles 23,24 . However, these works neglected the effect of nanosturctures' shapes, and therefore, cannot reveal the intrinsic phase shift from these nanostructures accurately. Especially, the understanding on the intrinsic phase shift changes versus light wavelength, i.e. the dispersion of the intrinsic phase shift, is still missing. To our knowledge, no work explored the relationship between intrinsic phase shift versus wavelength, i.e. the intrinsic phase change dispersion. Particularly, this in...

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On the phase of plasmons excited by slits in a metal film

Cited by 59 publications

References 19 publications

Giant Optical Transmission of a Subwavelength Slit Optimized Using the Magnetic Field Phase

Giant Optical Transmission of a Subwavelength Slit Optimized Using the Magnetic Field Phase

Universal optical transmission features in periodic and quasiperiodic hole arrays

Phase change dispersion of plasmonic nano-objects

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