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¹H NMR: Complex Splitting

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...

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Related Experiment Video

Updated: Mar 24, 2026

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

Published on: March 23, 2017

[A Double Split Ring Terahertz Filter on Ploymide Substrate].

Jun He, Tie-jun Zhang, Wei Xiong

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|March 17, 2016

Summary

This summary is machine-generated.

Researchers developed flexible terahertz (THz) metamaterials using polyimide substrates, enabling curved surface applications. These THz devices demonstrate stable performance and broadband filtering capabilities, overcoming limitations of traditional silicon-based structures.

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Last Updated: Mar 24, 2026

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

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Published on: July 18, 2015

Area of Science:

Metamaterials science
Terahertz (THz) technology
Applied electromagnetics

Context:

Metamaterials offer unique electromagnetic properties not found in nature.
Silicon substrates are common for THz metamaterials but are rigid and fragile.
Flexible substrates are needed to expand THz metamaterial applications.

Purpose:

To investigate polyimide as a flexible substrate for THz metamaterials.
To design and characterize double splits ring resonators (DSRRs) on polyimide.
To explore the potential for broadband THz filtering using stacked polyimide metamaterials.

Summary:

Polyimide exhibits suitable THz transmittance and optical properties (refractive index 1.9, 80% transmittance).
DSRRs on polyimide maintain resonant amplitude and frequencies under varying incidence angles and curvature.
Stacked polyimide metamaterials achieved a 181 GHz bandwidth (at 50% intensity) for broadband filtering.

Impact:

Polyimide enables the fabrication of flexible and potentially conformable THz metamaterial devices.
This research opens possibilities for curved surface THz filtering and novel device designs.
The developed broadband THz filter offers a simple manufacturing approach with significant filtering effects.