Near-infrared dyes for two-photon absorption in the short-wavelength infrared: strategies towards optical power limiting

Abstract

The recent advances in the field of two-photon absorbing chromophores in the short-wavelength infrared spectral range (SWIR 1100–2500 nm) are summarized, highlighting the development of optical power limiting devices in this spectral range.

Modified Indulines: From Dyestuffs to In Vivo Theranostic Agents

“…Although compound 8b is not formally centrosymmetric, this behavior is classical for quasi-quadrupolar polymethine structures. 42,43 In a mixture of n-heptane and dichloromethane (DCM), 8b exhibits a bathochromically shifted absorption towards 570 nm accompanied by a decrease of its intensity with increasing proportion of heptane (Figure S21). This noticeable change can be attributed to the formation of Jaggregates, presumably as dimer, as evidenced by X-ray analysis (Figure S19).…”

Synthesis and photophysical properties of nitrated aza-BODIPYs

“…In the past decade, boron difluoride chelates of the aza-dipyrromethene core (aza-BODIPY) have experienced a surge of interest due to their intense absorption and emission profiles in the near-infrared (NIR) region. 1–5 These properties make them exciting candidates for application in both the physical and biological sciences which include their use as sensors in molecular imaging, 6–16 light-activated singlet oxygen generating therapeutics, 17–24 solar cells, 25–29 and non-linear optical materials. 30–33 In many of these applications, a central research component involves the search for an effective method to bathochromically shift aza-BODIPY absorption and emission profiles.…”

Infrared broadband nonlinear optical limiting technology based on stimulated Brillouin scattering in As2Se3 fiber

“…In order to prevent human eyes and some sensitive sensors from highpower infrared lasers, it is necessary to explore NOL technology used in the infrared wavelength range. The main approaches of infrared broadband NOL technology are based on nonlinear absorption (NA) [9] , reverse saturable absorption (RSA) [10] , two-photon absorption (TPA) [11] , and phase change [12] . While it is relatively easy to protect against a single wavelength laser, the currently available broadband high-power laser sources require an NOL technology to operate in a wide wavelength range [13] .…”