Temperature dependence of the absorption edge of synthetic diamond

Using optical spectroscopy in the spectral range from 200 to 300 nm, the absorption edge and transmission spectra of 7 samples of synthetic diamond of IIa type in the temperature range from 12 K to 470 K was studied. Using numerical methods, the temperature dependences of optical absorption into the free exciton state were obtained for negative and positive phonon branches

Photoluminescence and optical absorption of diamond samples containing NV centers

NV center is an impurity defective complex in diamond, obtained by irradiating with highenergy electrons samples containing nitrogen in a substituting position and post radiating annealing. NV centers are observed in several charge states negative (zero phonon line at 638 nm), neutral (ZPL at 575 nm), and, possibly, positive (ZPL at 533 nm). NV centers in diamond are candidates for qubits for quantum computing, the basis of high speed magnetometric sensors, sources of single photons, and also emitting centers of optically active laser media

Solar wind detector based on Cherenkov radiation in diamond

To date a relevant task is the development of miniature Cherenkov detectors that could be placed on microsatellites for studying near Earth space, in particular, for observing the charged particles flows (solar wind) captured by the Earth's magnetic field. Solar activity can negatively affect the exploration of outer space, in particular, lead to the failure of the electronic equipment of spacecraft, which leads to significant financial losses. Therefore, the problem of monitoring and space weather forecasting is a very important task

Prototype of a diamond based UV source as an emitter

The report deals with the results of a study of the exciton cathodoluminescence of diamond, as well as the creation of a prototype of a cathodoluminescent ultraviolet source based on it

Detection of high energy electrons by Cherenkov radiation in diamond

Cherenkov detectors for detection of high energy particles are widely used. To obtain the necessary information about the characteristics of the particles (energy, type, etc.) can by analyze of the Cherenkov radiation (CR). Cherenkov detectors in various fields of science and technology are used. However, there are Cherenkov detectors applications, for example, in thermonuclear reactors and spacecraft, where special requirements are imposed on the radiator material. One of the promising radiator materials with high temperature and radiation resistance is diamond. In addition, the diamond has a low energy threshold for CR due to its high refractive inde

Changes in the exciton cathodoluminescence spectra of diamond at elevated temperatures

The study of exciton cathodoluminescence in diamond is not only scientific but also practical importance. Ultraviolet radiation at a wavelength of 235 nm can be used for disinfection, activation of surface reactions, photochemistry, and more. Thus, diamond is a promising material for creating a cathodoluminescent source of ultraviolet radiation

Carbon electronics and photonics

Diamond surpasses all known semiconductors in basic parameters, second only to gallium arsenide and graphene (a quasimetallic form of carbon) in electron mobility. For a long time, the widespread use of diamond in electronics was limited by the high cost and poor quality of both natural and synthetic raw materials. Currently, the technology of synthesis and doping of diamond has reached the necessary level for the breakthrough of diamond into electronics and photonics [1, 2]. In the first place, diamond based electronic devices will ensure long term and efficient operation in high temperature conditions and high levels of ionizing radiation, in the subterahertz frequency rang

Amplified spontaneous emission at nv centers in diamond under optical pumping

NV – centers in diamond – a unique quantum object, which potentially implements singlephoton sources for quantum cryptography problems, physical implementation of q-bits (quantum logic elements), magnetometric sensors, etc. [1–3]. The creation of photonic integrated circuits based on diamond involves the creation of optical analogs of elements implemented in existing integrated circuits, that is, in the process of growing a diamond processor, it is necessary to create optical fibers, splitters, interferometers and integrated laser sources. But if the creation of a passive element base based on diamond does not cause difficulties, the implementation of laser sources was hampered by the presence of two diamond charge states (NV0 and NV-). As shown by recent studies [4], the neutral charge state (NV0 – center) is a negative factor for the generation of laser radiation

Change of cathodoluminescence spectra of dimonds irradiated by electron beam

Here we investigate the changes in the cathodoluminescence spectra of HPHT diamonds irradiated by electron beam at the room temperature (298 K) and liquid nitrogen temperature (77K). The temperature of diamond samples was varied from 80 to 300 K. The RADAN-220-IMA3-150E accelerator was used as a source of electrons (120 keV). For temperature control we used platinum thermo-resistor. All experiments were conducted in the vacuum chamber (10-2 Pa). Optical spectra of diamonds cathodoluminescence were recorded ever ~ 30 K and then compared with each other