Table 1 Measured physical dimension of the gold disks on the quartz substrate for different nominal (designed) values of disk diameter d.

From: Direct Measurement of Optical Force Induced by Near-Field Plasmonic Cavity Using Dynamic Mode AFM

d (nm)

250

300

450

500

550

600

625

650

700

750

đ (nm)

170

242.5

392.5

465

495

545

567.5

610

630

695

dup (nm)

130

205

315

400

430

460

470

530

550

610

dlo (nm)

210

280

470

530

560

630

665

690

710

780

τ (nm)

16

16

15.5

15.5

15.5

15.5

15.5

15.5

15.5

15.5

F o /F T

5.031

5.004

5.032

4.938

4.367

2.272

1.453

1.092

0.929

2.459

F o /F

0.924

0.927

0.930

0.929

0.930

0.913

1.039

0.908

1.487

0.945

  1. From the AFM image shown in Fig. 1(c), we find the actual shape of the gold disk is like a thin truncated circular cone with upper diameter dup, lower diameter dlo and thickness τ. The mean diameter of the gold disks is defined as đ = (dup + dlo)/2, which is smaller than the nominal value of d as listed blow, whereas the measured period of the nano-disk array is found to be accurate as the designed value of d + 200 nm. The calculated values of Fo/FT and Fo/F in the far field using Eq. (5) are also listed for different values of d.
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