Metal-mesh achromatic half-wave plate for use at submillimeter wavelengths.
ABSTRACT A metal-mesh achromatic half-wave plate (HWP) has been designed, manufactured, and tested for potential use in millimeter and submillimeter astronomical instruments. The prototype device presented here is based on a 12-grid Shatrow [IEEE Trans. Antennas Propag. 43, 109 (1995)] recipe to operate over the frequency range of 120-180 GHz. Transmission line modeling and finite-element analysis [Ansoft HFSS website: http://www.ansoft.com/hfss/] were used to optimize the design geometrical parameters in terms of the device transmission, reflection, absorption, phase-shift, and cross-polarization as a function of frequency. The resulting prototype device was constructed and characterized using incoherent radiation from a polarizing Fourier transform spectrometer to explore its frequency and polarization behavior. These measurements are shown to be in excellent agreement with the models. Lists of the achieved HWP performance characteristics are reported.
SourceAvailable from: tstnetwork.org[Show abstract] [Hide abstract]
ABSTRACT: In this work we present the latest improvements on the fabrication of a non-crystal achromatic half-wave plate working in the sub-THz frequency range . This is achieved by hot-pressing polypropylene layers with photo-lithographed copper structures. We will discuss the performance of the first prototypes and a few techniques for the improvement of future designs. General considerations at the root of achromatic designs will also be touched upon which are valid for both optical and waveguide phase modulators.
[Show abstract] [Hide abstract]
ABSTRACT: We present a polarisation rotator based on a dielectrically embedded metal Mesh Half Wave Plate (MHWP) working in the W-band frequency range (75–110 GHz). The device was realised using metallic grids with sub-wavelength anisotropic geometries able to mimic the behaviour of natural birefringent materials. The device was designed using a combination of transmission line codes and finite-element analysis able to achieve phase accuracy down to a fraction of degree. Very accurate intensity and phase measurements were carried out using coherent radiation from a Vector Network Analyser (VNA). The presented device performs better and it is much thinner than previous devices having reduced the number of grids by a factor two and minimised their inductive losses. The new mesh HWP has excellent performances in terms of differential phase-shift flatness and cross-polarisation respectively 180.4 ± 2.9 • and −28 dB across a 25% bandwidth.
[Show abstract] [Hide abstract]
ABSTRACT: Circular polarisers are used to convert linear-into circular-polarisation, and vice versa. This is achieved by introducing a phase-shift of 90 • between two orthogonal polarisations passing through the device. These devices can be designed using slabs of birefringent mate-rial with the appropriate thicknesses (Quarter-Wave Plates). An interesting alternative solution consists of designing planar metallic grids with sub-wavelength geometries that exhibits differ-ent behaviour along two orthogonal axes. In this work we present a broadband dielectrically embedded quasi-optical polariser built using photolithographic techniques. The device was ex-perimentally tested using a Vector Network Analyser working in W-band (75–110 GHz). The presented results are in excellent agreement with finite-element analysis simulations: across a 30% bandwidth the transmission along the two axes and the very flat differential phase-shift are respectively: T C = 0.92, T L = 0.95 and ∆ϕ LC = 89.3 ± 1.5 • .