Bar code reader for the THz region

Abstract

We demonstrate a bar code sensing system for the THz region using leaky parallel plate waveguide and an off-axis parabolic mirror. The bars of the bar code are made from metal with air as gaps between them. We use up to 6 bars in the barcode system which can store up to 64 bits. Because the system employs coherent detection, we can further increase the bit density by adding Teflon strips to the barcode, encoding information in both amplitude and phase delay. These bar codes can be manufactured easily and inexpensively, offering a versatile alternative to RFID tags.

3D‐Printed Photonic Crystal Sub‐Terahertz Leaky‐Wave Antenna

“…The produced “rainbow” pattern has been demonstrated in a variety of THz applications, including beam steering, [ 11,12 ] frequency‐division multiplexing, [ 13,14 ] link discovery, [ 15 ] radar, [ 16,17 ] and THz identification tags. [ 18 ] The functionality of a leaky‐wave antenna is determined by the characteristics of the propagating mode, specifically its wavevector β . Indeed, for a leaky‐wave antenna with a single slot, the energy leaks at the angle cos θ = β/ k 0 , where k 0 = ω/ c is the free‐space wavevector.…”

Conformal leaky-wave antennas for wireless terahertz communications

“…Here, we present an original study of conformal THz antennas. Our antenna design builds on the well-known architecture of leakywave antennas, as these have proven to be invaluable for numerous applications at both RF frequencies [20][21][22] and THz frequencies [23][24][25][26][27][28][29] . Moreover, the leaky-wave waveguide offers a variety of possibilities for adaptation to a non-planar geometry [30][31][32][33][34] and can be easily engineered to explore a wide range of the relevant parameter space.…”