Functional Microstructures by Self-Assembly - Molecular Self-Assembly: Advances and Applications - page 400

obtained for the cornered waveguides, implying extreme flexible
routing using the self-assembly process for waveguide fabrication.
Measurements of the response of multiple waveguides with
varying lengths allowed for the determination of loss as a function
of distance (Fig. 12.10). For 100 nm wide QDWs the extracted loss
was 3 dB/2.26 m

for 500 nm wide waveguides, which is an improvement compared
to the prior state of the art subdiffraction structures. Furthermore,
crosstalk between neighboring QDWs was evaluated and found to
be negligible for QDW

µ

m for 100 nm wide waveguides, and 3 dB/4.06

µ

−

QDW separation as small as 200 nm. These
characteristics allude to the QDWs being a promising intermediate
for the integration of photonic devices into high-density electronics
[5].

Figure 12.10 QD waveguide behavior. Measured transmission results

for (a), (b) 500 nm wide, straight QDW, and (c), (d) corner
waveguide with 10 10 μm 2 dimension. Comparison of

signal strength on the waveguide and the substrate with (a),
(c) showing the net signal power and (b), (d) displaying the
relative power vs. the initial pump power. The inset in (d)
shows a fluorescence micrograph of the corner waveguide.
Reprinted with permission from Ref. [6]. Copyright 2006
American Chemical Society.

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