Analytical technique for subwavelength far field imaging

Thongrattanasiri, Sukosin; Kuhta, Nicholas A.; Escarra, Matthew D.; Hoffman, Anthony J.; Gmachl, Claire F.; Podolskiy, Viktor A.

doi:10.1063/1.3487779

Cited by 15 publications

(12 citation statements)

References 19 publications

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“…As a result, MEF often occurs with an increased excitation-relaxation cycling rate. In spite of these disadvantages, MEF and its related phenomena have found widespread use in fluorescence sensing [11-15], for novel probes [16-18], single molecule detection [19-21] and sub-diffraction limited microscopy [22-25]. …”

Section: Introductionmentioning

confidence: 99%

Radiative decay engineering 6: Fluorescence on one-dimensional photonic crystals

Badugu¹,

Nowaczyk²,

Descrovi³

et al. 2013

Analytical Biochemistry

162

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During the past decade the interactions of fluorophores with metallic particles and surfaces has become an active area of research. These near-field interactions of fluorophores with surface plasmons have resulted in increased brightness and directional emission. However, using metals provide some disadvantages, like quenching at short fluorophore-metal distances, increased rates of energy dissipation due to lossy metals. These unfavorable effects are not expected in dielectrics. In this paper we describe the interactions of fluorophores with one-dimensional (1D) photonic crystals (PCs), which have alternating layers of dielectrics with dimensions that create a photonic bandgap (PBG). Freely propagating light at the PBG wavelength will be reflected. However, similar with metals, we show that fluorophores within near-field distances of the 1DPC interacts with the structure. Our results demonstrated that these fluorophores can interact with both Internal Modes (IM) and Bloch Surface Waves (BSW) of the 1DPC. For fluorophores on the surface of the 1DPC the emission dominantly occurs through the 1DPC and into the substrate. We refer to these two phenomena together as Bragg Grating-Coupled Emission (BGCE). Here we describe our preliminary results on BGCE. 1DPCs are simple to fabricate and can be handled and reused without damage. We believe BGCE provide opportunities for new formats for fluorescence detection and sensing.

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Section: Introductionmentioning

confidence: 99%

Radiative decay engineering 6: Fluorescence on one-dimensional photonic crystals

Badugu¹,

Nowaczyk²,

Descrovi³

et al. 2013

Analytical Biochemistry

162

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“…In recent papers [33,34], it was numerically demonstrated that using subwavelength gratings the surface waves from a point source could be converted into the propagating waves, thus achieving the superresolution of λ/20. This was implemented by means of several stacked diffraction gratings of different subwavelength periods and arbitrary apertures [33] and a metallic subwavelength grating with high permittivity (ε = -100) [34]. However, the use of focusing or imaging optical elements was not considered in the above works.…”

Section: Focal Spot Reduction By Modulation Of Refractive Indexmentioning

confidence: 99%

Planar Gradient Hyperbolic Secant Lens for Subwavelength Focusing and Superresolution Imaging

Kotlyar¹,

Kovalev²,

Nalimov³

2012

Optics

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Integral relations to describe the propagation of a TE-wave from an external point source through the two-dimensional medium (plane interface) and the plane-parallel plate are proposed. We discuss three types of waves that contribute to the resulting light field, namely, the propagating waves and the first-and second-type surface waves. The comparison of near-field refractive lenses (SIL, NAIL) and a planar hyperbolic secant lens shows their numerical apertures to have close values, with the difference being as small as 5% for the Si-based optical elements. The FDTD-method simulation shows that by combining the gradient-index hyperbolic secant lens with a subwavelength diffraction grating or replacing it with its binary analog, the focal spot size can be made, respectively, 10% and 20% smaller than the diffraction-limited resolution in the 2D medium. We design a Si-based, planar binary microlens to generate a near-surface focal spot of full-width half-maximum size FWHM=0.102λ, where λ is the incident wavelength, which is practically devoid of side-lobes. It is shown that about 10 percent of the total incident beam energy goes to the far-field zone.

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“…Numerical extraction of information about the unknown object was suggested as a basis for IMM in previous studies [14,15]. However, it was shown that in practice the implementation of such algorithms require extreme efforts in equipment calibration [15,24].…”

Section: Theoretical Analysismentioning

confidence: 99%

“…In interscale mixing microscopy (IMM) [14,15], a diffractive element is employed to out-couple information about sub-wavelength features of the object into the far field, similarly to SIM, with the final image formed using a post-processing of the information carried by multiple diffractive orders (Fig.1b). Although IMM somewhat resembles SIM and FSL, in contrast to the latter approaches, IMM utilizes multiple diffractive orders of the grating and therefore provides a resolution that is limited only by experimental noise.…”

Section: Introductionmentioning

confidence: 99%

“…[30] Interscale mixing microscopy (IMM), first proposed in Ref. [14] relies on a diffraction element -positioned in the near field proximity to an object -to fold the evanescent information into the propagation zone (Figure 1). Such folding essentially mixes the information about sub-wavelength features of the object with the information about diffraction-limited features.…”

Section: Introductionmentioning

confidence: 99%

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Interscale mixing microscopy: far-field imaging beyond the diffraction limit

Roberts¹,

Olivier²,

Wardley³

et al. 2016

Optica

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We present an analytical description and an experimental realization of interscale mixing microscopy, a diffractionbased imaging technique that is capable of detecting wavelength/10 objects in far-field measurements with both coherent and incoherent broadband light. This method aims at recovering the spatial spectrum of light diffracted by a subwavelength object based on far-field measurements of the interference created by the object and a finite diffraction grating. A single measurement, analyzing the multiple diffraction orders, is often sufficient to determine the parameters of the object. The presented formalism opens the door for spectroscopy of nanoscale objects in the far-field.

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Analytical technique for subwavelength far field imaging

Cited by 15 publications

References 19 publications

Radiative decay engineering 6: Fluorescence on one-dimensional photonic crystals

Radiative decay engineering 6: Fluorescence on one-dimensional photonic crystals

Planar Gradient Hyperbolic Secant Lens for Subwavelength Focusing and Superresolution Imaging

Interscale mixing microscopy: far-field imaging beyond the diffraction limit

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