microscopy

Overview

Brief introduction to Raman spectroscopy of materials

Growth of out-of-plane standing MoTe$_{2(1-x)}$Se$_{2x}$/MoSe$_2$ composite flake films by sol-gel nucleation of MoO$_y$ and isothermal closed space telluro-selenization

This study describes the sol-gel processing of MoO$_y$ on Si (100) to subsequently achieve out-of-plane MoTe$_{2}$/MoSe$_{2}$ flake composite films by an isothermal closed space vapor transformation. The oxide precursor films have been prepared from …

Nanostructural changes upon substitutional Al doping in ZnO sputtered films

Al:ZnO layers, with low and high Al content, 0.2% and 2.1% cat. respectively, have been prepared using the RF magnetron sputtering technique. Noticeable differences in the optical and electrical properties have been detected in these films. With …

Lattice damage in 9-MeV-carbon irradiated diamond and its recovery after annealing

We have studied the radiation damage in diamond as a function of layer depth upon self-ion implantation with 9-MeV carbon ions and its recovery after annealing at $1000^\circ$C. Raman and photoluminescence spectra show substantial damage of the …

Micro-Raman spectroscopy of near-surface damage in diamond irradiated with 9-MeV boron ions

We have studied the near-surface damage in a diamond crystal caused by irradiation with swift boron ions and its healing after high-temperature annealing. A diamond crystal was irradiated with 9-MeV $^{11}$B$^{3+}$ ions with fluence values between $1 …

Differences in n-type doping efficiency between Al- and Ga-ZnO films

A careful and wide comparison between Al and Ga as substitutional dopants in the ZnO wurtzite structure is presented. Both cations behave as n-type dopants and their inclusion improves the optical and electrical properties of the ZnO matrix, making …

Raman spectroscopy analysis of pigments on Diego Velazquez paintings

Raman micro-spectroscopy has been used for the identification of the pigments used by the Spanish painter Diego Velázquez (1599–1650), considered one of the greatest painters in art history. The set of cross-sectional samples studied belongs to …

Fotónica y nanotecnología

In this paper we deal with the intimate connection between photonics and nanotechnology. We will briefly review the optical methods to observe and manipulate nanometric particles and describe how one can modify the photonic response of materials by …

Lattice-Mismatch Induced Stress in Porous Silicon Films

We have studied the stress in porous silicon films with different porosities at the interface with the substrate. Micro-Raman spectra were measured along a cleaved cross section to sample different layer depths. Each spectrum was fit to the phonon …

Depth-Resolved Microspectroscopy of Porous Silicon Multilayers

We have measured micro-photoluminescence (PL) and micro-Raman spectra on the cross section of porous silicon multilayers to sample different layer depths. We find noticeable differences in the spectra of layers with different porosity, as expected …