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Rachel Oliver (scientist)
Rachel Angharad Oliver is a Professor of Materials Science at the University of Cambridge and a fellow of Robinson College, Cambridge. She works on characterisation techniques for gallium nitride materials for dark-emitting diodes and laser diodes. Early life and education Oliver studied engineering and materials science at the University of Oxford and completed an industrial placement in metallurgy. Her final year masters project was in optoelectronic materials. She completed her Doctor of Philosophy degree at the University of Oxford in 2003, where she began to work with gallium nitride under the supervision of Andrew Briggs. She used metalorganic vapour-phase epitaxy (MOVPE) to grow quantum dots. Research and career She joined the University of Cambridge in 2003 as a Royal Commission for the Exhibition of 1851 postdoctoral research fellow. In 2006 Oliver was awarded a Royal Society University Research Fellowship (URF) at the University of Cambridge. She studied the morpholo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Cambridge
The University of Cambridge is a Public university, public collegiate university, collegiate research university in Cambridge, England. Founded in 1209, the University of Cambridge is the List of oldest universities in continuous operation, world's third-oldest university in continuous operation. The university's founding followed the arrival of scholars who left the University of Oxford for Cambridge after a dispute with local townspeople. The two ancient university, ancient English universities, although sometimes described as rivals, share many common features and are often jointly referred to as Oxbridge. In 1231, 22 years after its founding, the university was recognised with a royal charter, granted by Henry III of England, King Henry III. The University of Cambridge includes colleges of the University of Cambridge, 31 semi-autonomous constituent colleges and List of institutions of the University of Cambridge#Schools, Faculties, and Departments, over 150 academic departm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Society
The Royal Society, formally The Royal Society of London for Improving Natural Knowledge, is a learned society and the United Kingdom's national academy of sciences. The society fulfils a number of roles: promoting science and its benefits, recognising excellence in science, supporting outstanding science, providing scientific advice for policy, education and public engagement and fostering international and global co-operation. Founded on 28 November 1660, it was granted a royal charter by Charles II of England, King Charles II and is the oldest continuously existing scientific academy in the world. The society is governed by its Council, which is chaired by the society's president, according to a set of statutes and standing orders. The members of Council and the president are elected from and by its Fellows, the basic members of the society, who are themselves elected by existing Fellows. , there are about 1,700 fellows, allowed to use the postnominal title FRS (Fellow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2025 New Year Honours
The 2025 New Year Honours are appointments by King Charles III among the 15 Commonwealth realms to Orders and decorations of the Commonwealth realms, various orders and honours to recognise and reward good works by citizens of those countries. The New Year Honours are awarded as part of the New Year celebrations at the start of January and those for 2025 were announced on 30 December 2024. The recipients of honours are displayed as Style (form of address), styled before appointment to the honour awarded upon the advice of the King's ministers and arranged by country, precedence and grade (''i.e.'' Knight/Dame Grand Cross, Knight/Dame Commander, ''etc.''), and then by divisions (''i.e.'' Civil, Diplomatic, and Military), as appropriate. United Kingdom Below are the individuals appointed by Charles III in his right as Monarchy of the United Kingdom, King of the United Kingdom of Great Britain and Northern Ireland with honours within his own gift or upon the advice of his Governmen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Order Of The British Empire
The Most Excellent Order of the British Empire is a British order of chivalry, rewarding valuable service in a wide range of useful activities. It comprises five classes of awards across both civil and military divisions, the most senior two of which make the recipient either a Orders, decorations, and medals of the United Kingdom#Modern honours, knight if male or a dame (title), dame if female. There is also the related British Empire Medal, whose recipients are affiliated with the order, but are not members of it. The order was established on 4 June 1917 by King George V, who created the order to recognise 'such persons, male or female, as may have rendered or shall hereafter render important services to Our Empire'. Equal recognition was to be given for services rendered in the UK and overseas. Today, the majority of recipients are UK citizens, though a number of Commonwealth realms outside the UK continue to make appointments to the order. Honorary awards may be made to cit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Academy Of Engineering
The Royal Academy of Engineering (RAEng) is the United Kingdom's national academy of engineering. The Academy was founded in June 1976 as the Fellowship of Engineering with support from Prince Philip, Duke of Edinburgh, who became the first senior fellow and remained so until his death. The Fellowship was incorporated and granted a royal charter on 17 May 1983 and became the Royal Academy of Engineering on 16 March 1992. It is governed according to the charter and associated statutes and regulations (as amended from time to time). In June 2024 His Majesty the King became Patron of the Academy. Conceived in the late 1960s, during the Apollo space program and Harold Wilson's espousal of " white heat of technology", the Fellowship of Engineering was born in the year of Concorde's first commercial flight. The Fellowship's first meeting, at Buckingham Palace on 11 June 1976, enrolled 126 of the UK's leading engineers. The first fellows included Air Commodore Sir Frank Whittle, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fellow Of The Institute Of Materials, Minerals And Mining
The Institute of Materials, Minerals and Mining (IOM3) is a British engineering institution with activities including promotion of the development of materials science. It has been a Charitable organization, registered charity governed by a royal charter and a member of the United Kingdom's Science Council, since 2002. In 2019, the IOM3 celebrated the 150-year anniversary of the establishment of the Iron and Steel Institute which the IOM3 now encompasses. In 2022, it had a gross income of £3.99 million. Structure Having resided at Carlton House Terrace off Pall Mall, London, Pall Mall in St James's in central London since 2002, the institute moved to 297 Euston Road on 30 June 2015. The organization has its membership, education, sales, and knowledge transfer office in Grantham. Members qualify for different grades of membership, ranging from Affiliate to Fellow of the Institute of Materials, Minerals and Mining (FIMMM), depending on academic qualifications and professional e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rabi Oscillation
In physics, the Rabi cycle (or Rabi flop) is the cyclic behaviour of a two-level quantum system in the presence of an oscillatory driving field. A great variety of physical processes belonging to the areas of quantum computing, condensed matter, atomic and molecular physics, and nuclear and particle physics can be conveniently studied in terms of two-level quantum mechanical systems, and exhibit Rabi flopping when coupled to an optical driving field. The effect is important in quantum optics, magnetic resonance, and quantum computing, and is named after Isidor Isaac Rabi. A two-level system is one that has two possible energy levels. One level is a ground state with lower energy, and the other is an excited state with higher energy. If the energy levels are not degenerate (i.e. don't have equal energies), the system can absorb or emit a quantum of energy and transition from the ground state to the excited state or vice versa. When an atom (or some other two-level system) is illum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indium Gallium Nitride
Indium gallium nitride (InGaN, ) is a semiconductor material made of a mix of gallium nitride (GaN) and indium nitride (InN). It is a ternary group III/ group V direct bandgap semiconductor. Its bandgap can be tuned by varying the amount of indium in the alloy. InxGa1−xN has a direct bandgap span from the infrared (0.69 eV) for InN to the ultraviolet (3.4 eV) of GaN. The ratio of In/Ga is usually between 0.02/0.98 and 0.3/0.7. Applications LEDs Indium gallium nitride is the light-emitting layer in modern blue and green LEDs and often grown on a GaN buffer on a transparent substrate as, e.g. sapphire or silicon carbide. It has a high heat capacity and its sensitivity to ionizing radiation is low (like other group III nitrides), making it also a potentially suitable material for solar photovoltaic devices, specifically for arrays for satellites. It is theoretically predicted that spinodal decomposition of indium nitride should occur for compositions between 15% and 85%, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scanning Capacitance Microscopy
Scanning capacitance microscopy (SCM) is a variety of scanning probe microscopy in which a narrow probe electrode is positioned in contact or close proximity of a sample's surface and scanned. SCM characterizes the surface of the sample using information obtained from the change in electrostatic capacitance between the surface and the probe. History The name Scanning Capacitance Microscopy was first used to describe a quality control tool for the RCA/CED (Capacitance Electronic Disc), a video disk technology that was a predecessor of the DVD. It has since been adapted for use in combination with scanned probe microscopes for measuring other systems and materials with semiconductor doping profiling being the most prevalent. SCM applied to semiconductors uses an ultra-sharp conducting probe (often Pt/Ir or Co/Cr thin film metal coating applied to an etched silicon probe) to form a metal-insulator-semiconductor (MIS/MOS) capacitor with a semiconductor sample if a native oxide is prese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atom-Probe Tomography
The atom probe was introduced at th14th Field Emission Symposium in 1967by Erwin Wilhelm Müller and J. A. Panitz. It combined a field ion microscope with a mass spectrometer having a single particle detection capability and, for the first time, an instrument could “... determine the nature of one single atom seen on a metal surface and selected from neighboring atoms at the discretion of the observer”. Atom probes are unlike conventional optical or electron microscopes, in that the magnification effect comes from the magnification provided by a highly curved electric field, rather than by the manipulation of radiation paths. The method is destructive in nature removing ions from a sample surface in order to image and identify them, generating magnifications sufficient to observe individual atoms as they are removed from the sample surface. Through coupling of this magnification method with time of flight mass spectrometry, ions evaporated by application of electric pulses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laser Diode
file:Laser diode chip.jpg, The laser diode chip removed and placed on the eye of a needle for scale A laser diode (LD, also injection laser diode or ILD or semiconductor laser or diode laser) is a semiconductor device similar to a light-emitting diode in which a diode pumped directly with electrical current can create active laser medium, lasing conditions at the diode's p–n junction, junction. Driven by voltage, the doped p–n-transition allows for carrier generation and recombination, recombination of an electron with a electron hole, hole. Due to the drop of the electron from a higher energy level to a lower one, radiation is generated in the form of an emitted photon. This is spontaneous emission. Stimulated emission can be produced when the process is continued and further generates light with the same phase, coherence, and wavelength. The choice of the semiconductor material determines the wavelength of the emitted beam, which in today's laser diodes range from the inf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light-emitting Diode
A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor. White light is obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device. Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared (IR) light. Infrared LEDs are used in remote-control circuits, such as those used with a wide variety of consumer electronics. The first visible-light LEDs were of low intensity and limited to red. Early LEDs were often used as indicator lamps, replacing small incandescent bulbs, and in seven-segment displays. Later developments produced LEDs available in visible, ultraviolet (U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
