Flexible terahertz fiber optics with low bend-induced losses

Ito, Takahiro; Matsuura, Yuji; Miyagi, Mitsunobu; Minamide, Hiroaki; Ito, Hiromasa

doi:10.1364/josab.24.001230

Cited by 88 publications

(50 citation statements)

References 17 publications

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“…A 2D simulation of our 2-inch diameter 90 o off-axis parabolic mirror using COMSOL gives the Gaussian beam waist w at focal point of 3.19 mm, which is about 68.15% of the core radius . Using mode-coupling theory for HCMW [47], the coupling coefficient between the free-space Gaussian beam and the desired HE11 mode in the proposed Bragg fiber is estimated to be 88%, thanks to the similar Bessel function patterns between the HE11 mode in Bragg fiber and the TE11 mode in HCMW. The coupling coefficient into our proposed Bragg fiber is thus fundamentally high.…”

Section: Measurement Results and Discussionmentioning

confidence: 98%

“…The material structure of the proposed Bragg fiber, which uses a single dielectric, reduces the complexity of fabrication, while also making the fiber suitable for sensing applications in acidic or high magnetic field environment, which can be problematic for metallized waveguides [8], [9], [25]. We also demonstrate that 3D printing using digital light processing techniques can be used to conveniently and cost-effectively fabricate high-porosity air-core Bragg fibers, which is challenging for other fabrication techniques.…”

mentioning

confidence: 94%

“…As the signal frequency moves deeper into the THz region, the high Ohmic loss of metals and dielectric material absorption make many traditional waveguides and fibers unsuitable for the low-loss long-distance guidance of THz waves [ 6 ], [ 7 ], including hollow metallic waveguide [8], [9], coaxial cable [ 10 ], microstrip [ 11 ], coplanar waveguide [ 12 ], substrate integrated waveguide [13], [14], and optical fiber [15].…”

mentioning

confidence: 99%

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Low-Loss Asymptotically Single-Mode THz Bragg Fiber Fabricated by Digital Light Processing Rapid Prototyping

Hong

Swithenbank

Greenall

et al. 2018

IEEE Trans. THz Sci. Technol.

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Abstract-In this paper, the design and measurement of a 3D-printed low-loss asymptotically single-mode hollow-core terahertz Bragg fiber is reported, operating across the frequency range from 0.246 to 0.276 THz. The HE11 mode is employed as it is the lowest loss propagating mode, with the electromagnetic field concentrated within the air core as a result of the photonic crystal bandgap behavior. The HE11 mode also has large loss discrimination compared to its main competing HE12 mode. This results in asymptotically single-mode operation of the Bragg fiber, which is verified by extensive simulations based on the actual fabricated Bragg fiber dimensions and measured material parameters. The measured average propagation loss of the Bragg fiber is lower than 5 dB/m over the frequency range from 0.246 to 0.276 THz, which is, to the best of our knowledge, the lowest loss asymptotically single-mode all-dielectric microstructured fiber yet reported in this frequency range, with a minimum loss of 3 dB/m at 0.265 THz.Index Terms-Bragg fiber, electromagnetic propagation, millimeter wave technology, photonic crystals, three-dimensional printing.

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Section: Measurement Results and Discussionmentioning

confidence: 98%

mentioning

confidence: 94%

mentioning

confidence: 99%

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Low-Loss Asymptotically Single-Mode THz Bragg Fiber Fabricated by Digital Light Processing Rapid Prototyping

Hong

Swithenbank

Greenall

et al. 2018

IEEE Trans. THz Sci. Technol.

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“…Ito et al [20] reported losses 7.5-8 dB/m for hollow metallic waveguide with inner Ag coating. It can be noted that the losses from hollow metallic waveguide are limited to a several dB/m because the field penetrates into the metallic wall where the power is absorbed.…”

Section: Introductionmentioning

confidence: 99%

Design and Characterization Low-Loss Modes in Dielectric-Coated Hollow-Core Waveguides at THz Frequency

Aming

Rahman

2018

J. Lightwave Technol.

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract-Designs of hollow-core rectangular, circular, and elliptical waveguides with inner coating of silver and polystyrene (PS) are presented for low-loss terahertz guidance. The PS thickness deposited over silver is optimized to achieve the lowest possible loss for each waveguide at the frequency of 2.5 THz. The mode also tends to be a near-Gaussian in shape, easy for coupling to transmitter and receiver. The lowest propagation loss of 0.13 dB/m is obtained for the 02 LP mode in a circular waveguide with 2200 µm bore diameter by using a full-vectorial finite element method. It is also shown here that rectangular and elliptical waveguides with a similar core area offer a lower loss value for the Permanent repository link

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“…Other authors [385], [386], used the same concept to implement a very interesting flexible CWGs, with possible uses in remote THz spectroscopy. Manufacturing process and waveguide structure are schematized in Fig.…”

Section: Metallic (Microwave) Waveguides and Transmission Linesmentioning

confidence: 99%

Analysis and design of efficient passive components for the millimeter-wave and THz bands

Verdú¹,

Antonio²

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To my parents, brother and sister."Success is peace of mind which is a direct result of self-satisfaction in knowing you made the effort to become the best of which you are capable."Jonh Wooden "Lo que con mucho trabajo se adquiere, más se ama." Aristóteles AgradecimientosLa realización de esta tesis ha implicado no pocos años de trabajo y esfuerzo. Durante este importante periodo de mi vida han sido muchas las personas han estado a mi lado, brindándome su apoyo, ayuda, cariño y amor. Ya sea de una forma u otra, todas estas personas han contribuido a que este trabajo haya sido posible dando como fruto esta tesis. A todos ellos, me gustaría dedicarles un agradecimiento muy especial de todo corazón.Sin duda alguna, debo dar las gracias en primer lugar a mi director de tesis Mariano Baquero. Mariano, has sido un padre para mí profesionalmente hablando. Te conocí como alumno en las clases de Microondas, en las cuales me abriste la puerta a un conocimiento que me fascinó.Recuerdo perfectamente cuando fui a verte para preguntarte si podrías dirigirme el Proyecto Final de Carrera, y desde ese año 2009 hemos estado trabajando juntos. Quiero agradecerte no sólo haberme dado la oportunidad de trabajar en cada momento en elárea que más me ha gustado, sino el haberte preocupado por mí a nivel personal, velando siempre por mis intereses, ayudándome a desarrollarme personal y profesionalmente. Extiendo en este sentido mi agradecimiento a Miguel Ferrando. Si Mariano es el padre, tu serías sin duda el abuelo. Sin tu ayuda, la beca para la realización de esta tesis y los proyectos que han respaldado la misma no hubieran sido posibles. Tu esfuerzo ha permitido que el Grupo de Radiación Electromagnética (GRE) esté hoy dónde esta y que sus miembros nos beneficiemos de un entorno de trabajo excelente, produciendo trabajo de calidad. Debo agradecerte también tus siempre innovadoras ideas, algunas de las cuales se han convertido en una realidad plasmada en esta tesis.Una mención especial merece Daniel Sánchez. Dani, aunque tu nombre no figure como co-director bien sabes que podría estarlo. Jamás podré agradecerte lo suficiente la ayuda que me has prestado. Cuántas horas dedicadas a enseñarme en un sin fin de aspectos sin esperar nada a cambio, apoyándome también en los momentos difíciles, siempre presentes en una tesis. Bien sabes que lo mismo has hecho con cada uno tus compañeros, por eso eres el pilar del GRE Dani.Otra persona a la que estoy muy agradecido es a Vicente Boria. Tu activa colaboración en la dirección de esta tesis ha sido indispensable para la consecución de los resultados más relevantes de la misma. Sugeriste muy acertadamente una estancia en la Queen's University of Belfast, y me abriste la puerta a nuevas líneas de investigación en las cuales seguimos trabajando actualmente. Gracias por preocuparte por mi a nivel profesional y personal.En elámbito anterior, extiendo los agradecimientos a todo el GRE. It is also very important for me to acknowledge Prof. Vince Fusco. Thank you for hosting me in your group in Belfast ...

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Flexible terahertz fiber optics with low bend-induced losses

Cited by 88 publications

References 17 publications

Low-Loss Asymptotically Single-Mode THz Bragg Fiber Fabricated by Digital Light Processing Rapid Prototyping

Low-Loss Asymptotically Single-Mode THz Bragg Fiber Fabricated by Digital Light Processing Rapid Prototyping

Design and Characterization Low-Loss Modes in Dielectric-Coated Hollow-Core Waveguides at THz Frequency

Analysis and design of efficient passive components for the millimeter-wave and THz bands

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