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Raman spectroscopy, an optical microscopy technique, is a non-destructive chemical analysis technique that provides rich molecular fingerprint information about chemical structure, phase, crystallinity and molecular interactions. This technique relies on the interaction of light with chemical bonds in a material. However, because light is a wave, optical microscopy cannot resolve distances of less than half the wavelength from the light incident on the sample. This is known as the “diffraction limit,” which prevents Raman spectroscopy and other optical microscopy techniques from achieving nanoscale resolution. To increase the spatial resolution, another technique called “tip-enhanced Raman spectroscopy” (TERS) was invented, which can achieve a spatial resolution below the diffraction limit. In TERS, a nano-sized metal tip confines light in a nano-sized volume just above the sample. The light interacts with the sample molecules on the surface and imaging is done by analyzing the sc

Conventional nanoscale imaging is usually difficult to perform for large micron-scale samples due to aberrations caused by thermal effects and vibrations. Now, researchers from Japan are tackling this problem with a newly developed imaging system that compensates for the aberration. Credit: Professor Prabhat Verma of Osaka University Raman spectroscopy, an optical microscopy technique, is a non-destructive chemical analysis technique that provides rich molecular fingerprint information about chemical structure, phase, crystallinity and molecular interactions. This technique relies on the interaction of light with chemical bonds in a material. However, because light is a wave, optical microscopy cannot resolve distances of less than half the wavelength from the light incident on the sample. This is known as the “diffraction limit,” which prevents Raman spectroscopy and other optical microscopy techniques from achieving nanoscale resolution.

The fact that food prices in Australia have soared this year is not new news for most people. Key points: Deakin University research shows lettuce, broccoli and tomato prices have soared Amid other cost of living pressures, more people are seeking help with food costs There are calls for a national strategy to ensure Australians can access healthy food But tracking data for 28 specific grocery items over the past few years shows which product prices have gone up the most, which have fallen and which have remained stable. Figures from Deakin University’s Institute of Health Transformation support the most eye-catching increase – the skyrocketing price of lettuce. Data shows lettuce has jumped 150 percent in 12 months, up from the national average of $2 per head for icebergs last year to $5 in 2022. All kinds of leafy greens have disappeared from store aisles in recent months, including broccoli, which had the second biggest jump. It jumped from $6.90 per kilo in June last year to $11.90