Miniature Fourier transform spectrometer based on a fiber-tip interferometer

Abstract

The miniaturization of spectrometers have attracted much attention owning to the demand for portable or in situ spectral analysis in a wide variety of fields, but it is a great challenge to push them into practical applications due to high cost, complicated configuration, and sensitivity to external disturbance. We report on a miniature Fourier transform (FT) spectrometer based on fiber-tip Fizeau interferometer. Hand pulling or any other types of force can be used to drive optical path difference (OPD) scan. Interferences are monitored as a function of time by two photodetectors, one is used to detect the whole interferogram while the other to measure single-wavelength interferogram. In this design, the instantaneous interference intensity as well as OPD can be obtained in an accurate way so that the exact spatial interferogram of the incident spectrum can be worked out. Consequently, the incident spectrum can be retrieved by FT method. A resolution of 7.69 cm−1 in the wavelength range of 1400 nm ∼ 1700 nm is achieved. Experimental results show that the performance of our device is comparable to the commercial benchtop spectrometer. Our device is independent of the complicated fabrication procedures, easy of usage, and cost effective. We envision that the proposed design will inspire a new concept for constructing simple and cheap spectrometers that is well suited for practical applications.

Multirate Spectral Domain Optical Coherence Tomography

“…But these extra terms can be neglected in biological samples with small refractive index changes because usually 𝑟 (reflection coefficient) << 𝑡 (transmission coefficient), which will attenuate the multiple reflections. This approximation was first used in Fizeau interferometer [38] and is often used in interferometry. If the 𝑖 th surface is absent the 𝑎(𝑖) can be considered to be zero.…”

Enhancing detectivity in mid-infrared photodetectors through structural parameter engineering in HgSe-HgTe colloidal quantum dots

“…1 The spectrophotometers typically consist of two main components: wavelength-selective elements and photodetection elements. 2,3 Photodetection technologies, which convert photons into electrical signals, have been extensively investigated. 4 These photodetectors are categorized based on the range of electromagnetic radiation absorbed by the active layer, including X-ray, visible, and infrared (IR) photodetectors.…”

“…The interaction of light and matter has served as the foundation for optoelectronic devices and remains a focal point in quantum science 1 . The spectrophotometers typically consist of two main components: wavelength-selective elements and photodetection elements 2 , 3 . Photodetection technologies, which convert photons into electrical signals, have been extensively investigated 4 .…”