Browsing by Keyword "Quasioptics"
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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 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.