Optical waveguiding and lasing action in porphyrin rectangular microtube with subwavelength wall thicknesses

Area of Science:

• Organic Photonics
• Materials Science
• Nanotechnology

Background:

• Waveguide lasing action is well-studied in various microcavity geometries.
• Sharp-bending waveguides for light interconnection in photonic circuits remain underexplored.

Purpose of the Study:

• To investigate microcavity effects in sharp-bending organic rectangular microtubes (RMTs).
• To demonstrate the potential of RMTs for light amplification and optical path manipulation in photonic circuits.

Main Methods:

• Synthesis of single crystalline tetra(4-pyridyl)porphyrin (H(2)TPyP)-RMTs using the VCR process.
• Observation of lasing action and waveguiding behavior in RMTs with sharp bends (ca. 90°) and subwavelength wall thicknesses.
• Analysis of amplified spontaneous emission (ASE) and vibronic lasing action through spectral measurements and dependence on pump power and RMT dimensions.

Main Results:

• First observation of microcavity effects in sharp-bending organic RMTs.
• Demonstration of clear waveguiding behavior and bright tip emission from RMTs.
• Evidence of amplified spontaneous emission (ASE) and vibronic lasing action supported by spectral narrowing and mode spacing dependence.

Conclusions:

• Organic RMTs with sharp bends exhibit microcavity effects and waveguiding properties.
• The observed stimulated emission suggests RMTs can function as building blocks for integrated photonic circuits.
• This research opens possibilities for micromanipulation of optical paths and light amplification in advanced photonic devices.