Multiplexing the Raman Way

Multiplexing the Raman way.

On a long journey by sea from London to Bombay, the physicist C.V. Raman spent his time gazing at the ocean blue. Unsatisfied by a common explanation that the blue color was a reflection of the sky, he went on to show that the scattering of sunlight by water molecules gave the sea its color. His discovery of this phenomenon, named the “Raman effect,” supported the theory of the dual nature of m...

Raman-encoded microbeads for spectral multiplexing with SERS detection

Simultaneous detection of multiple molecular targets can greatly facilitate early diagnosis and drug discovery. Encoding micron-sized beads with optically active tags is one of the most popular methods to achieve multiplexing. Noble metal nanoparticle labels for optical detection by surface-enhanced Raman spectroscopy (SERS) exhibit narrow bandwidths, high photostability and intense Raman signa...

Multi-way based calibration transfer between two Raman spectrometers.

A standardization algorithm based on the application of Tucker3 models on the tensorized measurement signals is proposed to transfer calibration information between two Raman spectrometers. The secondary instrument in this study is a low cost and portable CCD based unit employing an efficient 532 nm green laser. The primary instrument is a high performance Fourier-transform based laboratory ins...

On Parmenides' Poem: "The Way of Truth" and "The Way of Opinion"

Multichannel Raman polarizer with suppressed relative intensity noise for wavelength division multiplexing transmission lines.

We propose a method of suppressing the relative intensity noise caused by polarization-dependent gain that is inherent to Raman polarizers (RPs). This method involves bit-synchronously scrambling the state of polarization of a pulse (bit) before the pulse enters the RP. The proposed solution works for RPs operating in a depleted regime and is compatible with multichannel configurations.