Terahertz scanning imaging with a subwavelength plastic fiber

Lu, Ja Yu; Chiu, Chui Min; Kuo, Chung Chiu; Lai, Chintu; Chang, Hung-Chung; Hwang, Yuh-Jing; Pan, Ci‐Ling; Sun, Chi‐Kuang

doi:10.1063/1.2816122

Cited by 29 publications

(10 citation statements)

References 14 publications

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“…Lu et al, in particular, have carried out a systematic study of loss as function of deflection angle for non porous subwavelength fibers. 22 Qualitatively, we find that 25cm long fiber pieces can still transmit light even when deflected by as much as 20deg.…”

Section: Resultsmentioning

confidence: 73%

Fabrication and THz loss measurements of porous subwavelength fibers using a directional coupler method

et al. 2009

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We report several strategies for the fabrication of porous subwavelength fibers using low density Polyethylene plastic for low-loss terahertz light transmission applications. We also characterize transmission losses of the fabricated fibers in terahertz using a novel non-destructive directional coupler method. Within this method a second fiber is translated along the length of the test fiber to probe the power attenuation of a guided mode. The method is especially suitable for measuring transmission losses through short fiber segments, a situation in which standard cutback method is especially difficult to perform. We demonstrate experimentally that introduction of porosity into a subwavelength rod fiber, further reduces its transmission loss by as much as a factor of 10. The lowest fiber loss measured in this work is 0.01 cm(-1) and it is exhibited by the 40% porous subwavelength fiber of diameter 380 microm. For comparison, the loss of a rod-in-the-air subwavelength fiber of a similar diameter was measured to be approximately 0.1 cm(-1), while the bulk loss of a PE plastic used in the fabrication of such fibers is >or= 1 cm(-1). Finally, we present theoretical studies of the optical properties of individual subwavelength fibers and a directional coupler. From these studies we conclude that coupler setup studied in this paper also acts as a low pass filter with a cutoff frequency around 0.3 THz. Considering that the spectrum of a terahertz source used in this work falls off rapidly below 0.25 THz, the reported loss measurements are, thus, the bolometer averages over the approximately 0.25 THz-0.3 THz region.

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Section: Resultsmentioning

confidence: 73%

Fabrication and THz loss measurements of porous subwavelength fibers using a directional coupler method

et al. 2009

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“…The second is the hollow type, which is essentially an air-core waveguide surrounded by a structured cladding and confines most of the power within the air-core region [2][3][4]. I will also discuss various fiber-delivery and fiber scanning THz imaging systems developed by using the demonstrated simple dielectric THz fibers and waveguides, including fiber-scanning THz transmission [8,9] and reflection [10] endoscopy, fiber-scanning near-field microscopy [ 1 1,12], fiber-delivered THz swept-source radar (equivalent to the THz OCT) [13], and pipe-based near-field in vivo imaging systems. Application on in vivo transmission THz mammography for early breast cancer detection [9,12] and for in vivo noninvasive blood glucose monitoring will also be discussed.…”

Section: Introductionmentioning

confidence: 99%

THz dielectric fiber based imaging: In vivo molecular imaging of water

Sun

2013

2013 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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“…Even though the waveguide modes are loosely confined and advantageous long-distance transmission via the plastic cores, the modal spot size is the issue in THz scanning imaging systems 15 . For THz sensing schemes, localized oscillation and interference in the sensors based on the resonant structures could assist to increase their sensitivities 16 .…”

Section: Introductionmentioning

confidence: 99%

Terahertz subwavelength ribbon waveguide based plasmonic sensors for refractive index and thickness detection

You

Chang

et al. 2012

SPIE Proceedings

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A terahertz plasmonic waveguide sensor is experimentally demonstrated to utilize surface waves propagated in a onedimension metal grating that constructed on a plastic ribbon waveguide. The grating conformation couples evanescent waves of a subwavelength terahertz waveguide onto the metal surface and highly confines the extended powers within λ/22-range for the phase-matching condition. The confined terahertz waveguiding waves resemble surface plasmonpolaritons but transmit with almost zero dispersion when the coupled surface waves interfere along the metal grating. Based on the dispersion-free guidance, there is Bragg reflection dominated by grating periods and strongly dependent on the refractive index of surface plasmon-polaritions. We successfully detect different thicknesses of polyethylene layers covered on the metal grating with thickness resolution of 1μm when the effective waveguide indices are modified in the vicinity of the metal grating, corresponding to 0.01-index variation. Potentially, terahertz subwavelength ribbon waveguide based plasmonic sensors could be manipulated to detect molecules with extremely low-density or small thickness in the metal-dielectric interface for probing pollution particles and any label-free detection.

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Terahertz scanning imaging with a subwavelength plastic fiber

Cited by 29 publications

References 14 publications

Fabrication and THz loss measurements of porous subwavelength fibers using a directional coupler method

Fabrication and THz loss measurements of porous subwavelength fibers using a directional coupler method

THz dielectric fiber based imaging: In vivo molecular imaging of water

Terahertz subwavelength ribbon waveguide based plasmonic sensors for refractive index and thickness detection

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