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Figure 5b shows the measured maximum thermally induced frequency shift from Figure 4 as a function of beam width for the constant-width and alternating-width arrays.

Using the thermal frequency shift model, we find that for both the constant-width and alternating-width arrays, the sensitivity of frequency to absorbed power is, for a 500-nm-wide beam, δ f/ Pabs = 6%/mW.

Figure 4a and b show color plots of the spectral density of transduced power as a function of the position of the laser beam across the constant-gap-width and alternate-gap-width arrays, respectively.

We find the data can be fitted well with this model for both constant- and alternating-width arrays and find that for a 500-nm-wide beam Pabs = 611 μW for the constant-width array and Pabs = 396 μW for the alternating-width array.

The mechanical transduction for each beam in the alternate-gap-width array is plotted in Figure 4d.

For the alternating-width array, the slightly larger focal width leads to a 500-nm-wide beam having 16% of the total power incident upon it.

To further investigate the transduction of each beam by its two neighboring slits, we perform measurements in which both structures were scanned through the focus of a laser beam (2.48 ± 0.06 μm fwhm for the constant-width array, 2.84 ± 0.13 μm for the alternating-width array), scanning orthogonal to the long axis of the beams.

The dips in the transduction are now much less pronounced compared to those observed for the constant-width array shown in Figure 4a and c and are in fact absent in most cases, showing that (dη/d x)(50 nm) ≠ (dη/d x)(20 nm).

Assuming the laser focus has a 2D Gaussian shape, the power density absorbed on one beam, with width w, can be expressed as a function of the incident power Pin and a parameter γ describing the fraction of incident power that is absorbed in the beam: 7For example, for the constant-width array, a 500-nm-wide beam has 18% of the total optical power incident upon it, given the laser spot size.

To investigate the influence of rod width, MINE arrays are fabricated with various rod widths from 66 to 122 nm and fixed t = 31 nm, g = 84 nm, r i  = 252 nm, and r o  = 349 nm.

An example of the equal-width detector array would be the General Electric Medical Systems, whereas the unequal-width detector arrays are represented by Marconi, Siemens and Toshiba Systems.