Giant optical transmission of subwavelength apertures for NSOM and data storage

Transmission through and wave guidance on metal plates perforated by periodic arrays of through‐holes of subwavelength coaxial cross‐section

“…In this regime, the scattered field is Figure 1 Structure configuration dominated by the zeroth-order diffraction mode outside the plate, and the TEM and TE 11 modes in the coaxial through-holes. An approximate expression for the zeroth-order electric field transmission coefficient T can be obtained via a standard modal approach [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. For example, following Chen [20] and enforcing field continuity across the hole to free-space apertures while representing fields in terms of constituents with odd and even tangential electric field symmetry about the z ϭ 0 plane results in an integral equation in Ref.…”

“…Phenomena of enhanced transmission of electromagnetic fields through plates perforated by doubly periodic arrays of throughholes of subwavelength cross-section [1][2][3][4][5][6][7][8][9][10][11][12] bode to enable numerous scientific and engineering technologies involving nearfield microscopy, optical data storage, and microwave and optical filtering and switching [13][14][15][16]. These phenomena, which manifest themselves as strong peaks in the frequency/angular dependencies of transmission coefficient magnitudes, have been observed in the optical, terahertz, and microwave regimes for holes of simply-and multiply-connected cross-sections [1][2][3][4][5][6][7][8][9][10][11][12].…”

“…In the present work, we develop a simple lumped circuit model for SLAs which can predict both steady state and transient response by using a SPICE simulator. Similar equivalent circuits have been developed earlier for laser diodes [11], quantum well lasers [12], photodetectors and photoreceivers [13], and recently for quantum cascade lasers [14]. Our circuit has been developed by using rate equations for carrier densities in a traveling wave SLA (TW-SLA).…”

Enhanced Terahertz Transmission Through Bullseye Plasmonics Lenses Fabricated Using Micromilling Techniques

“…The device has a full diameter of 25 mm and is surrounded by a support ring with a height of 2 mm the efficiency of which is directly related to the geometrical parameters of the grating structure. With the goal of increasing the data packing density of optical data recording structures, studies of EOT have primarily focused on applications at visible wavelengths to enhance transmission through subwavelength metallic hole arrays, slits, and bullseye (BE) lenses [7,9,10]. A similar gain in transmission can be achieved at THz frequencies by optimizing the grating parameters for this region.…”

Windmill-Shaped Subwavelength Apertures Operating in the Mid-IR Regime

“…Subwavelength apertures for biochemical sensing and spectroscopy applications in infrared regime were proposed [11]- [14]. Theoretical and experimental results have showed that the optical characteristics of the subwavelength apertures are highly dependent on the refractive index of the adjacent medium [18], film thickness [9], [10], polarization angle [11], [17], the incidence angle of the source [18], spatial periodicity of the array [12], type of the film material [11], the lattice geometry of the aperture [19], and the shape and the diameter of the aperture [1], [20]- [27]. The operating frequency range can be tuned by changing the subwavelength aperture dimensions.…”