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Typical output pulses for the lysozyme molecule obtained by the 40 nm SSLD (lower pulse), 20 nm SSLD (middle pulse), and 9 nm SSLD (upper pulse), respectively. The pulses have been offset for clarity. The measured response times are reported in Table I.
(a) Total ion count rate vs bias current and (b) ion count rate vs thickness at bias current of about for the 40 nm (dots), 20 nm (squares), and 9 nm (triangles) NbN parallel-SSLDs, respectively. In both plots, the total ion count rate is the average number of molecule hit events as counted by the time-to-digital converter within of every laser shot. In (b) the open symbols are the calculated area (Ref. 19) for the three thickness values. The solid and dashed lines represent the best fit of ion count rate and data, respectively.
Time-of-flight spectrum of lysozyme molecule from the 40 nm parallel-SSLD at a bias current of . The ion counts are plotted on a logarithmic scale to better show the very high signal to background ratio of the peaks.
Comparison of characteristic parameters of NbN SSLDs and Nb SSLD using strip-line 40 nm thick and wide. is the characteristic time introduced by Kaplan et al. in Ref. 18.
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