Detection of dynamic temperature modulation using a thermal scanning probe lithography (t-SPL) system.

Area of Science:

• Materials Science
• Nanotechnology
• Thermal Physics

Background:

• Nanoscale thermophysical property measurements traditionally rely on localized sensing.
• Localized heating has been proposed as an alternative but lacks validation for nanoscale property determination.
• Existing methods face challenges in achieving high spatial resolution for thermal property mapping.

Purpose of the Study:

• To demonstrate and validate the measurement of thermal diffusivity in nanoscale-confined volumes using localized nano-heating.
• To establish nano-heating as a viable alternative to nano-sensing for nanoscale thermophysical property characterization.
• To achieve nanoscale spatial resolution (10-100 nm) in thermal property measurements.

Main Methods:

• Utilized a thermal scanning probe lithography (t-SPL) system with a sharp tip for localized, periodic sample heating.
• Employed a pre-fabricated micro-thermocouple to detect the sample's temperature response.
• Applied the temperature wave analysis method to infer thermal diffusivity from frequency-dependent phase shifts.

Main Results:

• Successfully measured thermal diffusivity within a nanoscale-confined volume.
• Demonstrated that localized nano-heating achieves nanoscale spatial resolution (10-100 nm).
• Validated the t-SPL system for nanoscale thermal property assessment.

Conclusions:

• Nano-heating is a validated and effective method for nanoscale thermophysical property measurements.
• The t-SPL technique offers an alternative approach to miniaturizing detector sensors for high-resolution thermal analysis.
• This method provides a pathway for advanced characterization of materials at the nanoscale.