Resonant terahertz probes for near-field scattering microscopy

Siday, Thomas; Natrella, Michele; Wu, Jiang; Liu, Huiyun; Mitrofanov, Oleg

doi:10.1364/oe.25.027874

Cited by 12 publications

(24 citation statements)

References 35 publications

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“…6(b), where there is a strong resonant peak centered at ~0.3 THz. We estimate here the tip is ~250 µm long 14 . For resonant tips above 1 THz, we suggest tips with length <150 µm are used.…”

Section: Measuring the Scattering Efficiencymentioning

confidence: 84%

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Resonant scattering probes for terahertz near-field microscopy

Siday

Natrella

et al. 2018

Quantum Sensing and Nano Electronics and Photonics XV

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Section: Measuring the Scattering Efficiencymentioning

confidence: 84%

“…(b) Waveform measured when the indium tip is directly over the aperture. The emission of InAs (red) is magnified 10x on the y axis for clarity14 .…”

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confidence: 99%

Resonant scattering probes for terahertz near-field microscopy

Siday

Natrella

et al. 2018

Quantum Sensing and Nano Electronics and Photonics XV

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“…In this section, we change the particle–reflector distance and investigate the evolution of the Fano profile of the electric‐field spectra observed at a fixed distance from the particle. This case is represented in Figure b and corresponds to near‐field experiments where fields are detected using dipole probes (RF and microwave) or scattering tip probes (higher frequencies) …”

Section: Scattering‐tip Probes: Static Probe‐to‐particle Distance Chmentioning

confidence: 99%

“…This case is represented in Figure 1b and corresponds to near-field experiments where fields are detected using dipole probes (RF and microwave) or scattering tip probes (higher frequencies). [22,23] We conducted an experiment at gigahertz (GHz) frequencies using a dipole probe to detect the electric field. We studied nearfield resonances in a subwavelength-sized dielectric sphere of diameter d = 20 mm and made of a dense ceramic material of dielectric permittivity ε = 80 and tanδ = 10 −4 .…”

Section: Settings and Experimentsmentioning

confidence: 99%

Polarity of the Fano Resonance in the Near‐Field Magnetic‐Dipole Response of a Dielectric Particle Near a Conductive Surface

Khromova

Sayanskiy

Uryutin

et al. 2018

Laser & Photonics Reviews

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Fano resonances are observed in the near‐field electric‐field spectra of dielectric particles sustaining magnetic dipole resonances and located in the vicinity of a conductive surface (reflector). The polarity of these Fano resonances is defined by the relative positions of the resonant particle, the observation points, and the reflector. This paper studies two cases corresponding to common near‐field measurement techniques, where the electric field is detected by aperture‐based probes and scattering probes. In the first case, as the particle moves away from the reflector, the polarity of the observed Fano resonance reverses every quarter‐of‐a‐wavelength of the particle's magnetic resonance. In the second case, in addition to the periodic change of polarity, a phase shift of π is detected between the fields detected at the opposite sides of the resonant particle. This work proves, theoretically, that the observed Fano resonance polarities arise due to the interference between the external electric‐field standing wave and the resonant fields generated by the particle's magnetic dipole moment. The findings are supported by a recent terahertz experiment and the gigahertz experiment presented in this paper.

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“…Recent studies have shown that designing probes to act as resonant dipole antennas may mitigate the problem of low scattering efficiency, however these studies measured the field at the probe apex [3], [4]. Whilst this provides an indication of the scattering efficiency, it is not a direct measure.…”

Section: Introduction Cattering-type Near-field Microscopy (S-snommentioning

confidence: 99%