Dynamic control of optical transmission through a nano-slit using surface plasmons

Daniel, Salman; Saastamoinen, Kimmo; Saastamoinen, Toni; Rahomäki, Jussi; Friberg, Ari T.; Visser, Taco D.

doi:10.1364/oe.23.022512

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…Adjustable optical slits have found widespread applications in optical systems, such as optical measurement, masking, spectroscopic imaging and spectroscopy [1]- [3]. The traditional way to design an adjustable slit is by changing the distance of two blades mechanically [4]- [5].…”

Section: Introductionmentioning

confidence: 99%

Adjustable Optical Slit Based on the Phase Type Spatial Light Modulator

2019

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In this paper, we propose an adjustable optical slit based on a phase type spatial light modulator (SLM). The adjustable optical slit consists of two polarized beam splitters and one SLM. The SLM is used to modulate the phase of light. A phase grayscale with specific structure is produced, where the middle phase is 0 and the phase on both sides is π. By changing the width of the slit grayscale, we can adjust the width of the slit easily. Our experiment shows that one-dimensional (1-D) slit and 2-D mask can be realized and the slit width can be tuned accordingly. The results verify its feasibility. The adjustment accuracy of slit can reach several microns, and the slit can also be laterally translated. The proposed device can be used not only in optical system or holographic display to improve the quality of the image, but also in spectrometers to select the specific spectral feature.

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Section: Introductionmentioning

confidence: 99%

Adjustable Optical Slit Based on the Phase Type Spatial Light Modulator

2019

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“…Since the seminal work by Bethe, many studies have been devoted to understanding the physical mechanisms that underly the transmission of radiation through nanoapertures, − a topic of both fundamental and technical interest. Several methods have been proposed to dynamically control the total transmission, in order to achieve all-optical switching. − A useful next step would be to actively steer the radiation, something of great importance for applications such as selective probing of nanosamples, and all-optical circuits for telecommunication. Directional transmission has been achieved, for example, by using a single subwavelength slit surrounded by surface corrugations or grooves, , and by varying the refractive index of neighboring subwavelength slits .…”

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confidence: 99%

Active Two-Dimensional Steering of Radiation from a Nanoaperture

et al. 2018

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We experimentally demonstrate control over the direction of radiation of a beam that passes through a square nanoaperture in a metal film. The ratio of the aperture size and the wavelength is such that only three guided modes, each with different spatial symmetries, can be excited. Using a spatial light modulator, the superposition of the three modes can be altered, thus allowing for a controlled variation of the radiation pattern that emanates from the nanoaperture. Robust and stable steering of 9.5° in two orthogonal directions was achieved.

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“…2), as well as controls which make sure that the light emanating from the slit in Fig. 2 indeed is due to SPPs [24], are described in the Supplemental Material [25]. All components are aligned by checking their back reflection of the incoming beam to ensure that the beam passes through the center and that they are free from tilt.…”

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Surface Plasmons Carry the Pancharatnam-Berry Geometric Phase

Daniel

Saastamoinen

et al. 2017

Phys. Rev. Lett.

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Surface plasmon polaritons (SPPs) are electromagnetic surface waves that travel along the boundary of a metal and a dielectric medium. They can be generated when freely propagating light is scattered by structural metallic features such as gratings or slits. In plasmonics, SPPs are manipulated, amplified, or routed before being converted back into light by a second scattering event. In this process, the light acquires a dynamic phase and perhaps an additional geometric phase associated with polarization changes. We examine the possibility that SPPs mediate the Pancharatnam-Berry phase, which follows from a closed path of successive in-phase polarization-state transformations on the Poincaré sphere and demonstrate that this is indeed the case. The geometric phase is shown to survive the light→SPP→light process and, moreover, its magnitude agrees with Pancharatnam's rule. Our findings are fundamental in nature and highly relevant for photonics applications.

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Dynamic control of optical transmission through a nano-slit using surface plasmons

Cited by 10 publications

References 21 publications

Adjustable Optical Slit Based on the Phase Type Spatial Light Modulator

Adjustable Optical Slit Based on the Phase Type Spatial Light Modulator

Active Two-Dimensional Steering of Radiation from a Nanoaperture

Surface Plasmons Carry the Pancharatnam-Berry Geometric Phase

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