Characterization of T-ray binary lenses

Wang, S.; Yuan, Tao; Walsby, Edward; Blaikie, Richard J.; Durbin, Steven M.; Cumming, David R. S.; Xu, Jun; Zhang, X.-C.

doi:10.1364/ol.27.001183

Cited by 55 publications

(29 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Silicon is a highly suitable dielectric material for this purpose, as intrinsic silicon can have very low dissipation, and mature etching techniques are well-suited to produce a quasi-planar device with a finite number of levels. [98][99][100] These devices were significantly thinner than traditional lenses; the latter cited work had a device thickness of less than 500 µm. In another work, the negative shape of a stepped-lens structure was etched into silicon, and this was used in a stamp-like manner to imprint a stepped-phase focusing structure into a commonly used terahertz transparent polymer known as polypropylene.…”

Section: Wrapped Phasementioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

View full text Add to dashboard Cite

The terahertz range possesses significant untapped potential for applications including high-volume wireless communications, noninvasive medical imaging, sensing, and safe security screening. However, due to the unique characteristics and constraints of terahertz waves, the vast majority of these applications are entirely dependent upon the availability of beam control techniques. Thus, the development of advanced terahertz-range beam control techniques yields a range of useful and unparalleled applications. This article provides an overview and tutorial on terahertz beam control. The underlying principles of wavefront engineering include array antenna theory and diffraction optics, which are drawn from the neighboring microwave and optical regimes, respectively. As both principles are applicable across the electromagnetic spectrum, they are reconciled in this overview. This provides a useful foundation for investigations into beam control in the terahertz range, which lies between microwaves and infrared light. Thereafter, noteworthy experimental demonstrations of beam control in the terahertz range are discussed, and these include geometric optics, phased array devices, leaky-wave antennas, reflectarrays, and transmitarrays. These techniques are compared and contrasted for their suitability in applications of terahertz waves.

show abstract

Section: Wrapped Phasementioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Figure 10 is a schematic setup of Fresnel lens imaging. This distinctive property could be used to perform tomographic imaging of a target when used with broadband illumination [164,165]. The depth of focus of the THz wave mostly determines the resolution of this technique in the z dimension, so there is no restriction for narrowband imaging systems.…”

Section: Fresnel Lensesmentioning

confidence: 99%

Review of Terahertz Tomography Techniques

Guillet

Recur

Frederique

et al. 2014

J Infrared Milli Terahz Waves

215

104

View full text Add to dashboard Cite

“…Other types of flat focusing THz optics has recently been proposed, including GRIN lenses based on metallic 11 and dielectric 12-14 metamaterials, and Fresnel zone plate lenses. 15,16 However, all of these had dimensions much larger than a typical PCA. …”

Section: Introductionmentioning

confidence: 99%

Microstructured gradient-index lenses for THz photoconductive antennas

et al. 2016

View full text Add to dashboard Cite

A new type of substrate lens for photoconductive antennas (PCA’s) based on sub-wavelength microstructuring is presented and studied theoretically by the use of Greens function integral equation methods (GFIEM’s). By etching sub-wavelength trenches into a flat substrate, the effective dielectric constant can be designed to function like a gradient index (GRIN) lens. The proposed GRIN substrate lenses have sub-mm dimension, which is smaller than the dimensions of a typical hyper-hemispherical substrate lens (HSL), and could enable fabrication of arrays of closely packed PCA’s with individual lenses integrated directly into the PCA substrate. The performance of different GRIN lenses is compared to a HSL and shown to be comparable with regards to the terahertz radiation extraction efficiency, and it is shown that the collimating properties of these GRIN lenses can be tailored by changing the parameters used for microstructuring.

show abstract

Characterization of T-ray binary lenses

Cited by 55 publications

References 8 publications

Tutorial: Terahertz beamforming, from concepts to realizations

Tutorial: Terahertz beamforming, from concepts to realizations

Review of Terahertz Tomography Techniques

Microstructured gradient-index lenses for THz photoconductive antennas

Contact Info

Product

Resources

About