Browsing by Keyword "Subwavelength"
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Item Enhanced microwave transmission and beaming using a subwavelength slot in corrugated plate(2004-12) Beruete, M.; Campillo, I.; Dolado, J. S.; Rodríguez-Seco, J. E.; Perea, E.; Sorolla, M.; Tecnalia Research & Innovation; POWER SYSTEMS; DIGITAL ENERGYEnhanced microwave transmission and beaming through a subwavelength slot placed into a corrugated conducting plate is experimentally observed compared with the case of the single isolated slot. This phenomenon is similar to that happening for optical wavelengths where surface plasmons model is employed to describe the metal. This letter shows that the phenomenon is also present in the microwave range where perfect conductor model applies. Enhanced subwavelength transmission and beaming stimulates new research for future applications.Item Enhanced millimeter wave transmission through quasioptical subwavelength perforated plates(2005-06) Beruete, Miguel; Sorolla, Mario; Campillo, I.; Dolado, J. S.; Martín-Moreno, Luis; Bravo-Abad, J.; García-Vidal, F. J.; Tecnalia Research & InnovationIn this paper, we show that the phenomenon of extraordinary transmission through arrays of subwavelength holes, present in the optical regime, is also present in the millimeter wave range. After presentation of the theoretical foundations of the enhanced transmission, measurements of the transmission response have been performed on different samples by using a millimeter wave quasioptical vector network analyzer in the range between 45 and 110 GHz. The prototypes have been fabricated in Aluminum plates with several thickness and different hole diameters drilled by using a laser machine. Good agreement between theory and experiment is obtained, with clear signals of the existence of resonant transmission at wavelengths close to the period of the array. Possible applications in frequency selective surfaces and near-field imaging are envisaged.Item Increase of the transmission in cut-off metallic hole arrays(2005-02) Beruete, M.; Sorolla, M.; Campillo, I.; Dolado, J. S.; Tecnalia Research & InnovationIn this letter, the phenomenon of extraordinary transmission through arrays of subwavelength holes in the microwave range is demonstrated. It is also shown that the magnitude of the transmission is strongly dependent on the number of holes in the sample. Prototypes have been designed and fabricated in an Aluminum plate. The transmission response is measured with a millimeter wave quasi-optical vector network analyzer in the range between 40 and 70 GHz. These measurements show a resonant total transmission at wavelengths close to the period of the array which depends strongly on the number of resonant holes. These results can give rise to interesting applications such as frequency selective surfaces and other quasi-optical structures.Item Subwavelength slotted corrugated plate with enhanced quasioptical millimeter wave transmission(2005-04) Beruete, M.; Sorolla, M.; Campillo, I.; Dolado, J. S.; Tecnalia Research & InnovationEnhanced millimeter wave transmission through a subwavelenght slot placed into a corrugated conducting wafer, using perfect conductor model, is experimentally observed compared with the case of the single isolated slot. The corrugated wafer responds in a similar way as in the optical regime, in which a surface plasmon model is employed to describe the metal. Experimental results of the enhanced transmission and reflection of the corrugated wafer have been measured by using a quasioptical vector network analyzer. Future applications of enhanced subwavelength transmission in quasioptical devices are envisaged.