A5082543101- Photonic and Optical Devices
- Optical Polarization and Ellipsometry
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Quantum Chemical Studies
- Advanced Fluorescence Microscopy Techniques
- Linguistic Studies and Language Acquisition
- Photoreceptor and optogenetics research
- Spectroscopy and Laser Applications
- Spectroscopy and Chemometric Analyses
- Optical Coherence Tomography Applications
- Optical and Acousto-Optic Technologies
- Molecular spectroscopy and chirality
- Italian Literature and Culture
- Diverse academic and cultural studies
- Perovskite Materials and Applications
- Advanced Fiber Laser Technologies
- Remote-Sensing Image Classification
- Cultural Heritage Materials Analysis
- Photoacoustic and Ultrasonic Imaging
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Analytical Chemistry and Sensors
- Media, Communication, and Education
- Mechanical and Optical Resonators
- Advanced Optical Sensing Technologies
Politecnico di Milano
2017-2024
Tethys Research Institute
2018-2023
Università degli Studi Suor Orsola Benincasa
2016-2020
University of Rome Tor Vergata
2014
Sapienza University of Rome
2008
Structurally well-defined graphene nanoribbons (GNRs) are nanostructures with unique optoelectronic properties. In the liquid phase, strong aggregation typically hampers assessment of their intrinsic Recently we reported a novel type GNRs, decorated aliphatic side chains, yielding dispersions consisting mostly isolated GNRs. Here employ two-dimensional electronic spectroscopy to unravel optical properties GNRs and disentangle transitions underlying broad rather featureless absorption band....
We introduce a high-performance hyperspectral camera based on the Fouriertransform approach, where two delayed images are generated by Translating-Wedge-Based Identical Pulses eNcoding System (TWINS) [Opt.Lett.37, 3027 (2012)], commonpath birefringent interferometer that combines compactness, intrinsic interferometric delay precision, long-term stability and insensitivity to vibrations.In our imaging system, TWINS is employed as time-scanning generates high-contrast interferograms at...
The correlation of molecular excitation and emission events provides a powerful multidimensional spectroscopy tool, by relating transitions from electronic ground excited states through two-dimensional excitation-emission maps. Here we present compact, fast versatile Fourier-transform spectrometer, combining absorption fluorescence in the visible. We generate phase-locked pulse pairs via an inherently stable birefringent wedge-based common-path interferometer, retaining all advantages but...
We introduce a broadband single-pixel spectro-temporal fluorescence detector, combining time-correlated single photon counting (TCSPC) with Fourier transform (FT) spectroscopy. A birefringent common-path interferometer (CPI) generates two time-delayed replicas of the sample's fluorescence. Via FT their interference signal at we obtain two-dimensional map as function detection wavelength and emission time, high temporal spectral resolution. Our instrument is remarkably simple, it only...
Spectrally resolved measurements of optical activity, such as circular dichroism (CD) and rotatory dispersion (ORD), are powerful tools to study chiroptical properties (bio)molecular nanoplasmonic systems. The wider utilization these techniques, however, has been impeded by the bulky slow design conventional spectropolarimeters, which have limited a narrowband scanning approach for more than 50 years. In this work, we demonstrate broadband activity combining balanced detection scheme with...
We introduce a novel configuration for the broadband measurement of optical activity molecules, combining time-domain detection with heterodyne amplification.A birefringent common-path polarization-division interferometer creates two phase-locked replicas input light orthogonal polarization.The more intense replica interacts sample, producing chiral free-induction decay field, which interferes other replica, acting as time-delayed phase-coherent local oscillator.By recording delay-dependent...
Single-molecule spectroscopy (SMS) provides a detailed view of individual emitter properties and local environments without having to resort ensemble averaging. While the last several decades have seen substantial refinement SMS techniques, recording excitation spectra single emitters still poses significant challenge. Here we address this problem by demonstrating simultaneous collection fluorescence emission using compact common-path interferometer broadband excitation, which is implemented...
The full control of the fundamental photophysics nanosystems at frequencies as high few THz is key for tunable and ultrafast nanophotonic devices metamaterials. Here we combine geometrical optical properties halide perovskite nanoparticles, which constitute a prominent platform nanophotonics. pulsed photoinjection free carriers across semiconducting gap leads to subpicosecond modification far-field electromagnetic that fully controlled by geometry system. When nanoparticle size tuned so...
In this work, we show how the structural features of photoactive azobenzene derivatives can influence photoexcited state behavior and yield trans/cis photoisomerization process. By combining high-resolution transient absorption experiments in vis–NIR region quantum chemistry calculations (TDDFT RASPT2), address origin signals three poly-substituted push–pull azobenzenes with an increasing strength intramolecular interactions stabilizing planar trans isomer (absence H-bonds, methyl,...
We report on a Yb-pumped optical parametric oscillator (OPO) that delivers 30 fs pulses with spectral coverage from 680 to 910 nm and an average output power of up 1.1 W. The resulting peak is ∼0.5 MW, which is, the best our knowledge, highest ever demonstrated in femtosecond OPO. intensity noise remains at level 0.2% rms, rapid wavelength tuning obtained by simply scanning resonator length. performances OPO are promising for variety applications nonlinear microscopy ultrafast spectroscopy.
We introduce interferometric (I) Fourier-transform (FT) stimulated Raman scattering (SRS) to measure the complex nonlinear vibrational susceptibility of molecules. The technique is a simple variation FT-SRS, which was previously demonstrated combine very high sensitivity single-channel lock-in detection with spectral resolution afforded by FT spectroscopy. In IFT-SRS, local oscillator, temporally anticipated respect broadband pump pulse, enables both real and imaginary parts susceptibility,...
Nonlinear spectroscopy with quantum entangled photons is an emerging field of research that holds the promise to achieve superior signal-to-noise ratio and effectively isolate many-body interactions. Photon sources used for this purpose, however, lack frequency tunability spectral bandwidth demanded by contemporary molecular materials. Here, we present design strategies efficient spontaneous parametric downconversion generate biphoton states adequate at visible wavelengths. Importantly,...
Spectral imaging is a method to acquire the spectrum of light for each point in image scene. By combining classical with Fourier-transform spectrometry it possible hyperspectral images higher spectral accuracy and lower times compared standard dispersive optical systems. The technique based on interferometry hence technically challenging as requires generate field replicas delay controlled within small fraction (1/100 or better) cycle. Standard FT spectrometers are heavy, cumbersome too...
We present diffraction-limited photocurrent (PC) microscopy in the visible spectral range based on broadband excitation and an inherently phase-stable common-path interferometer. The excellent path-length stability guarantees high accuracy without need for active feedback or post-processing of interferograms. illustrate capabilities setup by recording PC spectra a bulk GaAs device compare results to optical transmission data.
Optical spectrometers can be generally divided into two categories, frequency-domain and time-domain ones. The former includes compact, industrial-grade instruments that are easily available in the visible spectral range. latter lab-grade, bulky fragile offer very high sensitivity accuracy but mainly limited to infrared region. This manuscript aims present a device several of its applications which it is possible combine some advantages techniques, finally, bringing advantage Fourier...
We introduce a compact hyperspectral camera based on the time-domain Fourier-transform approach, equipped with an ultrastable birefringent interferometer. The approach enables imaging shorter acquisition times and higher spectral accuracy compared to standard dispersive optics. provide experimental proofs of capability by performing remote-sensing measurements in visible near-infrared range. Recently we extended range thermal infrared, where vibrational transitions associated chemical bonds...
We introduce a FT-hyperspectral imager that incorporates an ultra-broadband common-path birefringent interferometer and we demonstrate the capabilities of system in spectral range from 400 to 2200 nm. The intereferometric was coupled initially first sensor, covering 400-1700 nm, later second allowing it cover region 1200 broadband working enabled simultaneous identification chlorophyll water content intact leaf materials characteristics pigments widely used antiquity present day.
We introduce a FT-hyperspectral imager that incorporates an ultra-broadband common-path birefringent interferometer and we demonstrate the capabilities of system in spectral range from 400 to 2200 nm. The intereferometric was coupled initially first sensor, covering 400-1700 nm, later second allowing it cover region 1200 broadband working enabled simultaneous identification chlorophyll water content intact leaf materials characteristics pigments widely used antiquity present day.
A class of hyperspectral imaging systems operating on an extremely wide spectral range has been developed based a new compact and reliable interferometer. The are portable feature high throughput low noise.