Fig. 1. The schematic image of sensor system using the extraordinary optical transmission phenomenon through the array of subwavelength holes (Light source; White light, LS; Lens, PL; Polarizer, MR; Mirror).
Fig. 3. Transmittance spectra through the subwavelength hole array. (a) Square array of 450 nm period, (b) 550 nm period, (c) 650 nm period. (d) Hexagonal array of 450 nm period, (b) 550 nm period, (c) 650 nm period. The inset is an SEM image of the subwavelength hole array and the scale bar is 500 nm.
Fig. 4. Calculated transmittance spectra through the nanohole square array with 250 nm-diameter when the refractive index is changed from 1.3 to 1.4. (a) The period is 450 nm. The inset is the near-field distribution through the hole arrays formed by the normally incident 700 nm wavelength light. The scale bar is 50 nm. (b) The period is 650 nm. The black and red curves correspond to water and ethanol, respectively.
Fig. 2. (a) Fabrication process of the subwavelength hole array. The schematic image of (b) hexagonal and (c) rectangular subwavelength hole array with desired condition; D (diameter of hole): 250 nm, P (period of array): 450 nm, 550 nm, 650 nm.
Fig. 5. (a) Peak shifts measured for a change in refractive index (led line; square array, blue line; hexagonal array, solid line; 450 nm period, dashed line; 550 nm period, dot line; 650 nm period). (b) Calculated sensitivity of transmittance spectra through the 250 nm-diameter nanohole array with 450 nm-period.
Table 1. Sensitivity of diverse nanostructures
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