2 research outputs found
Supplementary document for A flexible and accurate total variation and cascaded denoisers-based image reconstruction algorithm for hyperspectrally compressed ultrafast photography - 6744828.pdf
Supplemental Documen
Universal Near-Infrared and Mid-Infrared Optical Modulation for Ultrafast Pulse Generation Enabled by Colloidal Plasmonic Semiconductor Nanocrystals
Field effect relies
on the nonlinear current–voltage relation
in semiconductors; analogously, materials that respond nonlinearly
to an optical field can be utilized for optical modulation. For instance,
nonlinear optical (NLO) materials bearing a saturable absorption (SA)
feature an on–off switching behavior at the critical pumping
power, thus enabling ultrafast laser pulse generation with high peak
power. SA has been observed in diverse materials preferably in its
nanoscale form, including both gaped semiconductor nanostructures
and gapless materials like graphene; while the presence of optical
bandgap and small carrier density have limited the active spectral
range and intensity. We show here that solution-processed plasmonic
semiconductor nanocrystals exhibit superbroadband (over 400 THz) SA,
meanwhile with large modulation depth (∼7 dB) and ultrafast
recovery (∼315 fs). Optical modulators fabricated using these
plasmonic nanocrystals enable mode-locking and Q-switching operation
across the near-infrared and mid-infrared spectral region, as exemplified
here by the pulsed lasers realized at 1.0, 1.5, and 2.8 μm bands
with minimal pulse duration down to a few hundreds of femtoseconds.
The facile accessibility and superbroadband optical nonlinearity offered
by these nonconventional plasmonic nanocrystals may stimulate a growing
interest in the exploiting of relevant NLO and photonic applications