Applied Physics

Applications of physics in medicine, geophysics, the atmosphere, oceans, materials, photonics and the environment.

General idea of the topic

Applied physics serves as the direct interface between fundamental physical laws and transformative technologies: diagnostic medicine, photonic telecommunications, advanced materials science, geophysics, oceanography, and atmospheric dynamics. It translates quantum mechanics, electrodynamics, thermodynamics, and fluid mechanics into predictive engineering models capable of solving complex challenges across the biosphere, geosphere, and nanotechnology.

This module unites cellular and molecular biophysics, medical physics (radiotherapy and imaging modalities), photonics and optoelectronics, materials science and nanoscience, geophysics, atmospheric physics, physical oceanography, and environmental physics.

What you will truly understand

You will understand how unifying conservation and transport principles explain diverse physical phenomena: from neural action potential conduction via telegrapher cable equations, to seismic wave propagation across the Earth's mantle, to ionizing radiation deposition in biological tissues.

You will apply physical frameworks across twelve orders of spatial magnitude: from quantum confinement effects in 2D nanostructures to planetary thermohaline ocean circulation.

Recommended learning route

  1. Biophysics and Medical physics: cellular mechanics, patch-clamp ion channel kinetics, MRI nuclear physics, X-ray CT reconstruction, and radiation oncology.
  2. Photonics and Optoelectronics: semiconductor heterostructure lasers, dielectric optical waveguides, quantum dots, and surface plasmon polaritons.
  3. Materials science and Nanoscience: mechanical, thermal, and electronic properties of metamaterials, graphene, and 2D transition metal dichalcogenides.
  4. Geophysics and Earth sciences: seismic body and surface waves (P, S, Rayleigh, Love), gravimetric anomalies, geomagnetism, and mantle dynamics.
  5. Atmosphere, Oceans and Environment: atmospheric thermodynamics, stratified ocean rotating fluids, radiative equilibrium, and aerosol transport.

Physical criterion you must acquire

Identifying the characteristic spatial and temporal scales of a complex multiphysics system to apply the appropriate physical regime (continuum mechanics vs discrete microscopic transport).

Connection with real problems

  • Medical linear accelerators (LINACs) and proton therapy systems for precision oncological treatments.
  • Undersea dense-wavelength-division-multiplexing (DWDM) optical networks and silicon photonics.
  • Seismic early warning systems, geothermal reservoir characterization, and coupled ocean-atmosphere climate modeling.

Final goal of the topic

Master the interdisciplinary application of physics to medicine, nanotechnology, geosciences, and environmental systems to drive technological innovation.

Topics in this section

  • Biophysics

    Physics of biological systems, molecules, membranes, transport, biomechanics, and biological signals.

  • Medical Physics

    Medical imaging, radiotherapy, clinical dosimetry, ultrasound, MRI, and radiological safety.

  • Geophysics

    Physics of the solid Earth: gravity, seismology, geomagnetism, Earth's interior, and exploration methods.

  • Atmospheric Physics

    Thermodynamics, radiation, fluid dynamics, clouds, aerosols, and atmospheric circulation.

  • Physical Oceanography

    Physics of the ocean: currents, waves, tides, mixing, stratification, and exchange with the atmosphere.

  • Materials and Nanoscience

    Physical properties of materials, nanostructures, surfaces, defects, devices, and characterization.

  • Photonics and Physical Electronics

    Devices based on light, electrons, semiconductors, detectors, sensors, lasers, and optoelectronics.

  • Environmental Physics

    Transport of energy and matter in environmental systems, pollutants, radiation, noise, climate, and environmental measurements.