All-carbon THz components based on laser-treated diamond

Amoruso, Salvatore; Andreone, A.; Bellucci, A.; Koral, Can; Girolami, M.; Mastellone, Matteo; Mou, Sen; Orlando, S.; Papari, Gian Paolo; Paparo, D.; Polini, Riccardo; Rubano, Andrea; Santagata, A.; Serpente, Valerio; Valentini, Veronica

doi:10.1016/j.carbon.2020.03.023

Cited by 18 publications

(12 citation statements)

References 30 publications

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“…Diamond surface micromachining has demonstrated that it is possible to create LIPSS based micro solar cells due to the formation of "black diamond" [22]. This type of nanostructure exhibits efficient optical response to THz radiation [23].…”

Section: Introductionmentioning

confidence: 99%

Morphological Study of Nanostructures Induced by Direct Femtosecond Laser Ablation on Diamond

et al. 2021

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High spatial frequency laser induced periodic surface structure (HSFL) morphology induced by femtosecond laser with 230 fs pulse duration, 250 kHz repetition rate at 1030 nm wavelength on CVD diamond surface is investigated and discussed. The spatial modification was characterized and analyzed by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and 2D-Fast Fourier Transform (2D-FFT). We studied the effect of pulse number and laser power on the spatial development of nanostructures, and also deduced the impact of thermal accumulation effect on their morphology. A generalized plasmonic model has been used to follow the optical evolution of the irradiated surface and to determine the periodic value of the nanostructures. We suggest that non-thermal melting and plasmonic excitation are the main processes responsible for the formation of HSFL-type nanostructures.

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Section: Introductionmentioning

confidence: 99%

Morphological Study of Nanostructures Induced by Direct Femtosecond Laser Ablation on Diamond

et al. 2021

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“…It follows that together with the change of material topography ranging from LSFL to HSFL, which can strongly vary the material's wettability [70,83,84] and optical properties [60], even functionalizations can be provided by carefully controlling all materials' surface features as well as the laser beam and all the experimental parameters used (e.g., sample holder scanning speed, number of spatial effective incident pulses, material's roughness and its preparation, laser incidence angle, surrounding environment). Thanks to LIPSS and relative processes, new perspectives in the fields of application of WBS and dielectrics can be added, such as, for instance, diamond for solar energy conversion [60], THz optical components [72] or new optoelectronic devices driven by intermediate band formation within the material's bandgap, doping in the vicinity of surface defects or the assembling of new nanotemplate systems.…”

Section: Discussionmentioning

confidence: 99%

“…Both works aimed at developing electrodes for (bio)sensing, catalysis or energy storage. Additionally, in 2020, Amoruso et al [72] showed that the same technique allows one to tailor the absorption selectivity for polarized THz radiation in the range of (0.25-3) THz, proving the extreme versatility of surface nano-and micro-patterning. In that work, another aspect of surface functionalization was evidenced, as the surface was not only nano-patterned, but also graphitized, leaving a conductive overlayer on the surface able to modify the response of the system to THz radiations.…”

Section: Institute Of Physicsmentioning

confidence: 99%

LIPSS Applied to Wide Bandgap Semiconductors and Dielectrics: Assessment and Future Perspectives

Mastellone

Pace²,

Curcio

et al. 2022

Materials

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With the aim of presenting the processes governing the Laser-Induced Periodic Surface Structures (LIPSS), its main theoretical models have been reported. More emphasis is given to those suitable for clarifying the experimental structures observed on the surface of wide bandgap semiconductors (WBS) and dielectric materials. The role played by radiation surface electromagnetic waves as well as Surface Plasmon Polaritons in determining both Low and High Spatial Frequency LIPSS is briefly discussed, together with some experimental evidence. Non-conventional techniques for LIPSS formation are concisely introduced to point out the high technical possibility of enhancing the homogeneity of surface structures as well as tuning the electronic properties driven by point defects induced in WBS. Among these, double- or multiple-fs-pulse irradiations are shown to be suitable for providing further insight into the LIPSS process together with fine control on the formed surface structures. Modifications occurring by LIPSS on surfaces of WBS and dielectrics display high potentialities for their cross-cutting technological features and wide applications in which the main surface and electronic properties can be engineered. By these assessments, the employment of such nanostructured materials in innovative devices could be envisaged.

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“…Recently, spurred by the enormous improvement in the development of opto-electronic sources and detectors, spectroscopic characterization techniques started to thrive in this frequency range. The increasing interest in THz spectroscopy lies in its potential for providing accurate and precise deduction of the electro-optical properties for a wide range of materials with diverse properties 6 , which in turn leads to a better understanding of the operating principles of complex THz systems and devices 7 . Any significant progress in THz technologies for use in novel sensing and communication systems cannot leave out a concurrent advancement in the characterization techniques to determine how different materials, components, and systems respond to the impinging radiation 8 .…”

Section: Introductionmentioning

confidence: 99%

Accurate THz Ellipsometry Using Calibration in Time Domain

Mazaheri

Koral

Andreone

2021

Preprint

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We report on the realisation of a customized THz Time Domain Spectroscopic Ellipsometer (THz-TDSE) based on fiber-coupled photoconductive antennas, operating in a wide range of incident angles and allowing also standard transmission spectroscopy without any optical realignment. To ensure accurate parameter extraction for a broad range of materials, we developed a fast and effective algorithm-assisted method to calibrate the setup and compensate for the nonideality in the response of the THz system. The procedure allows to minimise errors induced by imperfect response of the antennas and polarizers, imprecise setting of the impinging and receiving angles in the goniometric mechanical arms, and unavoidable mismatches in the THz beam optics. Differently from other calibration methods applied in the literature, our approach compares in time domain the ellipsometric derived electric field s- and p-polarised components at a given angle of incidence with the reconstructed ones, attained by using the complex dielectric function of a known sample. The calibrated response is determined with high precision by setting the system in transmission mode. In order to validate the technique, ellipsometric measurements have been carried out at various angle of incidences on a number of materials both in solid and liquid form, and their data compared with what obtained by conventional THz spectroscopy. Results show that THz-TDSE accompanied with an accurate calibration procedure is an effective technique for material characterization, especially in case of samples with a high absorption rate that are not easily investigated through transmission measurements.

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All-carbon THz components based on laser-treated diamond

Cited by 18 publications

References 30 publications

Morphological Study of Nanostructures Induced by Direct Femtosecond Laser Ablation on Diamond

Morphological Study of Nanostructures Induced by Direct Femtosecond Laser Ablation on Diamond

LIPSS Applied to Wide Bandgap Semiconductors and Dielectrics: Assessment and Future Perspectives

Accurate THz Ellipsometry Using Calibration in Time Domain

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