Broadband saturated absorption properties of bismuthene nanosheets

Bismuthene nanosheets were exfoliated by the LPE method. And the SA properties have been studies by open aperture Z-scan method. The results showed bismuthene nanosheets display broadband saturated properties in near-infrared wavelengths.

The Cinematic Dispositif and Its Ghost

This chapter will engage with the work of the artist and photographer Hiroshi Sugimoto in order to reflect on the nature of the cinematic apparatus in the digital era. Sugimoto’s photographic work Theatres consists in a series of photographs of cinema theatres taken by the artist from the 1980s applying a wide-open aperture and an exposure as long as the film itself, capturing de facto an average of 170,000 frames in a single shot. The result is a ‘film in a single frame’, and a profound reflection on the role that time, lights, and the space of the audience play in the cinematic experience. The chapter looks from a cinematic perspective at the regenerative aspect of the photographic medium in its after-shot, a question called by Sugimoto a ‘resurrection’.

Nonlinear TeraHertz Transmission by Liquid Water at 1 THz

The solvation properties of liquid water originate from the transient network of hydrogen-bonded molecules. In order to probe the coupling between the different modes of this network, nonlinear terahertz (THz) spectroscopy techniques are required. Ideally, these techniques should use a minimal volume and capitalize on sensitive field-resolved detection. Here we performed open aperture z-scan transmission experiments on static liquid cells, and detect the THz fields with electro-optical techniques. We show that it is possible to quantify the nonlinear response of liquid water at ~1 THz even when large signals originate from the sample holder windows.

The pump fluence and wavelength-dependent ultrafast carrier dynamics and optical nonlinear absorption in black phosphorus nanosheets

Pump fluence and probe wavelength-dependent ultrafast carrier dynamics and optical nonlinear absorption in black phosphorus nanosheets are investigated by transient absorption spectroscopy and open-aperture Z scan techniques. The decay time becomes longer with larger wavelengths under pump wavelengths of both 400 nm and 800 nm excitation. For 800 nm excitation, pump fluence-dependent lifetime shows complex behaviors, which might be due to the competition between the linear absorption and two photon absorption. For 400 nm excitation, an additional decaying channel is observed at a larger pump fluence, which is explained by an effective subband structure. In open-aperture Z scan measurements, strong saturation absorption is observed in the visible region over a broad band from 450 nm to 700 nm. The saturation intensity shows an increasing trend with increase in the wavelength. Also, the saturation intensities under different pulse widths and solvents are discussed in detail. Our results show that black phosphorus nanosheets have great potential in future ultrathin optoelectronic devices.