High resolution on-chip spectroscopy based on miniaturized microdonut resonators

Abstract

We experimentally demonstrate a high resolution integrated spectrometer on silicon on insulator (SOI) substrate using a large-scale array of microdonut resonators. Through top-view imaging and processing, the measured spectral response of the spectrometer shows a linewidth of ~0.6 nm with an operating bandwidth of ~50 nm. This high resolution and bandwidth is achieved in a compact size using miniaturized microdonut resonators (radius ~2 μm) with a high quality factor, single-mode operation, and a large free spectral range. The microspectrometer is realized using silicon process compatible fabrication and has a great potential as a high-resolution, large dynamic range, light-weight, compact, high-speed, and versatile microspectrometer.

High-contrast gratings for integrated optoelectronics

“…It is also desirable in optical networks as a compact wavemeter. Significant progress has been made and chip-scale spectrometers have been demonstrated with various configurations, such as superprism or arrayed waveguide grating [92,93], Fabry-Perot filter array [94], microresonator array [95], etc. However, there is a fundamental tradeoff between the resolution and footprint on these dispersive components or resonance array.…”

Sub-Micrometer-Sized Spectrometer by Using Plasmonic Tapered Channel-Waveguide

“…However, the primitive grating-based-spectrometers should have large enough size to support diffraction and imaging of light, thus they have an intrinsic limit to miniaturizing their operating size [1][2][3][4]. Many studies of the spectrometer with micrometer scale [5][6][7][8][9] have come out recently, while the sub-micrometer region is still a challenge to design and operate.…”

High-resolution optical spectroscopy using multimode interference in a compact tapered fibre

“…In recent years, there has been a strong effort to develop novel spectrometers that are compact and have high resolving powers and operational bandwidths 5,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] . In addition to miniature grating spectrometers 12 , resonant structures such as nanocavities [13][14][15][16][17][18] have also been employed to separate spectral components into unique detectors.…”

“…In addition to miniature grating spectrometers 12 , resonant structures such as nanocavities [13][14][15][16][17][18] have also been employed to separate spectral components into unique detectors. This research has produced millimetre-scale spectrometers with high resolving powers of R410 4 , but with limited fractional bandwidth,…”