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Related Concept Videos

IR Absorption Frequency: Hybridization01:21

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Visible-to-mid-IR tunable frequency comb in nanophotonics.

Arkadev Roy1, Luis Ledezma1,2, Luis Costa1

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Researchers developed tunable optical frequency combs using lithium niobate nanophotonics. This breakthrough enables visible and mid-infrared comb generation on a single chip, overcoming spectral limitations for diverse applications.

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Area of Science:

  • Photonics
  • Nanotechnology
  • Quantum Optics

Background:

  • Optical frequency combs are crucial for metrology, ranging, and communications.
  • Current advancements primarily focus on near-infrared combs, limiting applications requiring visible and mid-infrared spectra, especially in nanophotonics.

Purpose of the Study:

  • To demonstrate widely tunable optical frequency comb generation in the visible and mid-infrared spectral regions using nanophotonic devices.
  • To overcome the spectral sparsity and limitations of existing nanophotonic comb sources.

Main Methods:

  • Utilized optical parametric oscillators integrated into lithium niobate nanophotonics.
  • Achieved octave-spanning tunability from 1.5 to 3.3 μm with femtojoule thresholds.
  • Employed up-conversion of infrared combs to generate visible combs down to 620 nm on the same chip.

Main Results:

  • Demonstrated sub-picosecond optical frequency combs with ultra-broadband tunability.
  • Achieved comb generation across visible (620 nm) to mid-infrared (3.3 μm) spectral ranges.
  • Showcased femtojoule-level energy thresholds for comb generation on a single nanophotonic chip.

Conclusions:

  • Presented a practical and universal approach for efficient nanophotonic frequency comb sources.
  • Overcame spectral sparsity limitations in nanophotonic comb generation.
  • Enabled versatile visible-to-mid-infrared spectral coverage for advanced applications.