Electron beam excitation of coherent sub-terahertz radiation in periodic structures manufactured by 3D printing

Phipps, A. R.; MacLachlan, A. J.; Robertson, C. W.; Zhang, Liang; Konoplev, I. V.; Cross, Adrian W.; Phelps, A. D. R.

doi:10.1016/j.nimb.2017.03.093

Cited by 20 publications

(34 citation statements)

References 19 publications

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“…In a slightly more exotic case, guide cladding is customized by 3D printing to contain metal inclusions inserted post-production [23]. Rapid prototyping has proved fruitful in testing periodic designs for use in a two-dimensional periodic surface lattice required in electron beam guidance [24]. Further complicated devices have been realized including dielectric metamaterials [25].…”

Section: Summary Of 3d Printing and Terahertz Researchmentioning

confidence: 99%

Feasibility and Characterization of Common and Exotic Filaments for Use in 3D Printed Terahertz Devices

Squires

Lewis

2018

J Infrared Milli Terahz Waves

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Recent years have seen an influx of applications utilizing 3D printed devices in the terahertz regime. The simplest, and perhaps most versatile, modality allowing this is Fused Deposition Modelling. In this work, a holistic analysis of the terahertz optical, mechanical and printing properties of 17 common and exotic 3D printer filaments used in Fused Deposition Modelling is performed. High impact polystyrene is found to be the best filament, with a useable frequency range of 0.1-1.3 THz, while remaining easily printed. Nylon, polylactic acid and polyvinyl alcohol give the least desirable terahertz response, satisfactory only below 0.5 THz. Interestingly, most modified filaments aimed at increasing mechanical properties and ease of printing do so without compromising the useable terahertz optical window. Abstract Recent years have seen an influx of applications utilizing 3D printed devices in the terahertz regime. The simplest, and perhaps most versatile, modality allowing this is Fused Deposition Modelling. In this work, a holistic analysis of the terahertz optical, mechanical and printing properties of 17 common and exotic 3D printer filaments used in Fused Deposition Modelling is performed. High impact polystyrene is found to be the best filament, with a useable frequency range of 0.1-1.3 THz, while remaining easily printed. Nylon, polylactic acid and polyvinyl alcohol give the least desirable terahertz response, satisfactory only below 0.5 THz. Interestingly, most modified filaments aimed at increasing mechanical properties and ease of printing do so without compromising the useable terahertz optical window.

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Section: Summary Of 3d Printing and Terahertz Researchmentioning

confidence: 99%

Feasibility and Characterization of Common and Exotic Filaments for Use in 3D Printed Terahertz Devices

Squires

Lewis

2018

J Infrared Milli Terahz Waves

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“…[10][11][12][13][14][15][16][17][18] However, a very few experiments have been carried out to actually generate high power microwaves with an electron beam passing through an MTM structure. [19][20][21][22][23] At MIT, in our previous experiment, 19 we built a structure with two MTM plates loaded in a waveguide with dimensions below the cut-off of the TM 11 mode. The implementation we chose is the complementary split ring resonators (CSRRs).…”

Section: Introductionmentioning

confidence: 99%

High power long pulse microwave generation from a metamaterial structure with reverse symmetry

Stephens

Mastovsky

et al. 2018

Physics of Plasmas

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Experimental operation of a high power microwave source with a metamaterial (MTM) structure is reported at power levels to 2.9 MW at 2.4 GHz in full 1 μs pulses. The MTM structure is formed by a waveguide that is below cutoff for TM modes. The waveguide is loaded by two axial copper plates machined with complementary split ring resonators, allowing two backward wave modes to propagate in the S-Band. A pulsed electron beam of up to 490 kV, 84 A travels down the center of the waveguide, midway between the plates. The electron beam is generated by a Pierce gun and is focused by a lens into a solenoidal magnetic field. The MTM plates are mechanically identical but are placed in the waveguide with reverse symmetry. Theory indicates that both Cherenkov and Cherenkov-cyclotron beam-wave interactions can occur. High power microwave generation was studied by varying the operating parameters over a wide range, including the electron beam voltage, the lens magnetic field, and the solenoidal field. Frequency tuning with a magnetic field and beam voltage was studied to discriminate between operation in the Cherenkov mode and the Cherenkov-cyclotron mode. Both modes were observed, but pulses above 1 MW of output power were only seen in the Cherenkov-cyclotron mode. A pair of steering coils was installed prior to the interaction space to initiate the cyclotron motion of the electron beam and thus encourage the Cherenkov-cyclotron high power mode. This successfully increased the output power from 2.5 MW to 2.9 MW (450 kV, 74 A, 9% efficiency).

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“…The first stage involves creating a wax former to the 10's of microns precision and then using this former to create a mold for the component, where the silver -chromium molten alloy is deposited. The transmission and reflection Compared with the previous experiment [7], improvements have been made to the electron gun and the solenoidal magnetic field system used to transport the annular electron beam through the cylindrical PSL interaction structure. An annular graphite cathode, with a sharpened annular emitting tip is used to create a hollow annular electron beam [9].…”

Section: Resultsmentioning

confidence: 99%

“…The tolerances achievable with 3D printing are projected to improve over time as the technology develops, resulting in higher degrees of accuracy. The operation of this W-band mm-wave source using the 3D printed PSL has been reported [7].…”

Section: Introductionmentioning

confidence: 99%

Metallic Periodic Surface Lattice Enhanced High-Power MM-wave Sources

MacLachlan

Yin

Zhang

et al. 2018

2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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Electron beam excitation of coherent sub-terahertz radiation in periodic structures manufactured by 3D printing

Cited by 20 publications

References 19 publications

Feasibility and Characterization of Common and Exotic Filaments for Use in 3D Printed Terahertz Devices

Feasibility and Characterization of Common and Exotic Filaments for Use in 3D Printed Terahertz Devices

High power long pulse microwave generation from a metamaterial structure with reverse symmetry

Metallic Periodic Surface Lattice Enhanced High-Power MM-wave Sources

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