Metal mesh resonant filters for terahertz frequencies.
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.
Melo
Arline M
AM
Center for Semiconductor Components, Campinas State University, Campinas, Brazil. armame@gmail.com
Kornberg
Mariano A
MA
Kaufmann
Pierre
P
Piazzetta
Maria H
MH
Bortolucci
Emílio C
EC
Zakia
Maria B
MB
Bauer
Otto H
OH
Poglitsch
Albrecht
A
da Silva
Alexandre M P Alves
AM
D004581:Electronics / Q000295:instrumentation; D004867:Equipment Design; D008027:Light; D008670:Metals; D008854:Microscopy, Electron; D010825:Physics / Q000379:methods; D012031:Refractometry / Q000379:methods; D012542:Scattering, Radiation; D013053:Spectrophotometry / Q000379:methods*; D014159:Transducers
D008670:Metals