7.2 Patterning and Assembly
221
Fig. 7.6 Example of a stacking process in which the 2D-materials flakes are imaged under laser
illumination at a wavelength of 532 nm (blocked in the detection path by proper filters), which excites
pronounced sample fluorescence around 620 nm (red glow) only for the direct-gaped monolayer
TMDCs. In the experiment discussed in [50], the flakes on specially prepared optical in-plane
microresonators with tailored height-profile modulation of the substrate show strong emission from
the cavity region, considerably stronger than for a simple reference hole in the same substrate
material with same depth. Therefor, monolayer WS 2 (c, d) was placed on a multilayer thin hBN
(a, b), which was before that transferred to a FIB-patterned GaP reference (e) or microcavity (f)
structure. Note that laser light is generally hazardous and can permanently damage the eyes, if they
are exposed to laser radiation. Working with lasers makes proper and accurate safety measures
mandatory. One must not repeat the here described experiments using laser light coupled into a
microscope without accurate and proper safety measures in compliance with laser safety norms,
particularly when using magnifying optics. (a–f) Reproduced with permission. [50] Copyright
2019 American Chemical Society
221
Fig. 7.6 Example of a stacking process in which the 2D-materials flakes are imaged under laser
illumination at a wavelength of 532 nm (blocked in the detection path by proper filters), which excites
pronounced sample fluorescence around 620 nm (red glow) only for the direct-gaped monolayer
TMDCs. In the experiment discussed in [50], the flakes on specially prepared optical in-plane
microresonators with tailored height-profile modulation of the substrate show strong emission from
the cavity region, considerably stronger than for a simple reference hole in the same substrate
material with same depth. Therefor, monolayer WS 2 (c, d) was placed on a multilayer thin hBN
(a, b), which was before that transferred to a FIB-patterned GaP reference (e) or microcavity (f)
structure. Note that laser light is generally hazardous and can permanently damage the eyes, if they
are exposed to laser radiation. Working with lasers makes proper and accurate safety measures
mandatory. One must not repeat the here described experiments using laser light coupled into a
microscope without accurate and proper safety measures in compliance with laser safety norms,
particularly when using magnifying optics. (a–f) Reproduced with permission. [50] Copyright
2019 American Chemical Society