Cross-shaped bandpass filters for the near- and mid-infrared wavelength regions

Möller, K. D.; Warren, J. B.; Heaney, James B.; Kotecki, Carl A.

doi:10.1364/ao.35.006210

Cited by 32 publications

(15 citation statements)

References 5 publications

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“…For a 0.3 mm thick mesh filter resonant at 300 GHz, the length is found to be 0.527 mm by full-wave simulations [19]. This is in good agreement with the calculated value of 0.531 mm from the empirical formula derived by Möller et al [20].…”

supporting

confidence: 83%

Micromachined Thick Mesh Filters for Millimeter-Wave and Terahertz Applications

Wang

Yang

Tian

et al. 2014

IEEE Trans. THz Sci. Technol.

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This paper presents several freestanding bandpass mesh filters fabricated using an SU-8-based micromachining technique. The important geometric feature of the filters, which SU8 is able to increase, is the thickness of the cross-shaped micromachined slots. This is five times its width. This thickness offers an extra degree of control over the resonance characteristics. The large thickness not only strengthens the structures, but also enhances the resonance quality factor ( -factor). A 0.3-mm-thick, single-layer, mesh filter resonant at 300 GHz has been designed and fabricated and its performance verified. The measured -factor is 16.3 and the insertion loss is 0.98 dB. Two multi-layer filter structures have also been demonstrated. The first one is a stacked structure of two single mesh filters producing a double thickness, which achieved a further increased -factor of 27. This is over six times higher than a thin mesh filter. The second multilayer filter is an electromagnetically coupled structure forming a two-pole filter. The coupling characteristics are discussed based on experimental and simulation results. These thick mesh filters can potentially be used for sensing and material characterization at millimeter-wave and terahertz frequencies.

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supporting

confidence: 83%

Micromachined Thick Mesh Filters for Millimeter-Wave and Terahertz Applications

Wang

Yang

Tian

et al. 2014

IEEE Trans. THz Sci. Technol.

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“…The filter central frequencies transmission and respective bandwidths were compared with results obtained by other authors [4,11,12], as shown in Figs. 6 and 7, respectively.…”

Section: Discussionmentioning

confidence: 98%

Metal mesh resonant filters for terahertz frequencies

et al. 2008

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The interest in terahertz photometric and imaging measurements has motivated the development of bandpass resonant filters to be coupled to multiple-pixel devices such as bolometer arrays. Resonant grids are relatively simple to fabricate, exhibiting high transmission at the central frequency, a narrow bandpass, and good rejection of the side frequencies of the spectrum. We have fabricated filters centered at different frequencies between 0.4 and 10 THz, using photolithography and electroforming techniques. Transmission measurements have shown center frequencies and bandwidths close to the design predictions. The performance of the filters was found not to be critically dependent on small physical deformations in the mesh, becoming more noticeable at higher frequencies (i.e., for smaller physical sizes). Wider bandwidths, needed to attain higher sensitivities in the continuum, were obtained by changing the design parameters for filters at 2 and 3 THz.

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“…18 The use of the Bragg stacks as an interference filter between the blackbody emitter and PV cell to tailor emission also leads to peaks in the emission spectrum outside the desired bandpass region. 19 Chase and Joseph 20 and Moller et al 21 first proposed using a crossmesh array in thin metallic films as a bandpass filter for the infrared region and found that the wavelength peak reflection is determined by the dimensions of the cross. Further contributions by Morgan et al reported the design and fabrication of nanoscale cross-patterned optical filters.…”

Section: Introductionmentioning

confidence: 99%

Wavelength-selective thermal extraction for higher efficiency and power density thermophotovoltaics

Jurado

Kou

Kamali

et al. 2018

Journal of Applied Physics

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Thermophotovoltaics have long been of interest as an energy conversion technology but suffer from low power density and low efficiency. Structured emitters designed to alter the emission spectrum and increase the efficiency are not stable at the necessary high emitter temperatures and also reduce the power density. Here, we propose a wavelength-selective thermal extraction device that mitigates these challenges and demonstrate a transfer-printing process needed to fabricate the device. The device consists of a ZnS solid hemisphere with a patterned thin film optical filter that passively increases the far-field radiated flux from an emitter within a wavelength band near the bandgap of a photovoltaic cell. Crucially, the device does not need to be in physical contact with the emitter and thus can be maintained at a lower temperature, circumventing the thermal stability challenge. Our work helps one to address long-standing issues with applications of thermophotovoltaics. Published by AIP Publishing. https://doi.

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Cross-shaped bandpass filters for the near- and mid-infrared wavelength regions

Cited by 32 publications

References 5 publications

Micromachined Thick Mesh Filters for Millimeter-Wave and Terahertz Applications

Micromachined Thick Mesh Filters for Millimeter-Wave and Terahertz Applications

Metal mesh resonant filters for terahertz frequencies

Wavelength-selective thermal extraction for higher efficiency and power density thermophotovoltaics

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