Broadband Optical Spectroscopy for Interdisciplinary Materials Research
Technical Report,01 Sep 2017,28 Feb 2019
Florida A and M University Tallahassee United States
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Optical spectroscopy is a very powerful tool for materials research that employs a wide range of frequencies in the electromagnetic spectrum to probe structural, electronic and magnetic properties of materials. Optical spectroscopy is a broadly defined term that includes spectroscopic techniques that involve use of electromagnetic spectrum in the energy range from far-infrared FIRTHz to ultraviolet UV. This energy scale carries the fingerprints of various physical phenomena that determine fundamental characteristics of material. Henceforth, optical spectroscopy remains as the best non-destructive characterization method for scientists across various disciplines such as physics, chemistry, life sciences and engineering. Investigations on materials properties require not only an accurate probing tool but also controlled external environments that tune the properties of materials. The response of materials to these external parameters unravels the microscopic phenomena responsible for their properties. The most common external control parameter is temperature and mechanisms involving very small energy scale are best analyzed at temperatures as low as possible. Therefore, spectroscopic studies are performed on materials at low temperatures. In addition to very low temperature, high magnetic fields and high pressures also act as excellent extreme conditions for manipulating material properties. Combining one or more of low temperature, high magnetic fields and high pressures with spectroscopic techniques requires superior experimental skills due to the difficulty level involved. Therefore, experiments employing all three extreme conditions are less common even though the yielded information is usually groundbreaking and extremely beneficial in understanding the nature of materials. It is also worth noting that spectroscopy in general is quite difficult to accomplish depending on the frequency range of the electromagnetic spectrum.
- Test Facilities, Equipment and Methods