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Antennas or aerials
Published in Geoff Lewis, Communications Technology Handbook, 2013
Turnstile antenna. This is the primitive version of the super turnstile antenna and simply consists of two crossed half-wave dipoles with the same 90° phasing. It forms a very simple but effective receiving antenna.
State of the Art of Nanoantenna Designs in Infrared and Visible Regions: An Application-Oriented Review
Published in IETE Technical Review, 2022
Priya Ranjan Meher, Abhiram Reddy Cholleti, Sanjeev Kumar Mishra
Coming to the part of light emission, researchers came up with a novel approach to photon absorption below the semiconductor bandgap resulting in photocurrent generation [22]. A structure [27] integrating nanoantenna with a single layer of MoS2 observed that photoluminescence intensity changes with the structure of nanoantenna and a research [29] showed an enhanced luminescence with germanium quantum dots. In particular, the research [41] observed a boost in the performance of the material, offering efficiency and stability in the conversion of photons to electrons. In the manipulation of light, a cross nano-antenna [18] with two dipoles is first in turnstile antenna having optical frequency with intensity independent of the polarization of light. There was an investigation [21] on radiation patterns and field enhancement of the unique structure cross-slot nanoantenna. A research [23] came up with a dual input nanoantenna to synthesize any specific polarization by tuning phase and amplitude using two feeding ports, another research [25] showed that on-wire lithography will help with tunability and broadband nature of nanoantenna. Moreover, the use of slot nanoantenna [26] was proposed as a method to realize spin-controlled surface plasmon polariton, radiation and polarization as shown in Figure 5(d). In particular, a modified bow-tie structure [39] using indium and tin oxide materials was developed to aid microscopy. In addition, researchers [31] reviewed enhancing the absorption of laser radiation and studied an approach to solve low energy conversion in photoconductive antennas. A heterostructure [33] fabricated at a low cost and demonstrated an ultra-fast response time of electron transfer in the order of 200 fs. Further details about other researcher’s designs including the materials used for the structure used for different applications are enlisted in Table 1.