John Lekner

Emeritus Professor - Physics School of Chemical and Physical Sciences

Courses

Teaching in 2017

Research interests

Electromagnetics, quantum physics.

EProf John Lekner profile picture

Research interests

Optics, electromagnetism and quantum theory

Propagation, polarization and reflection of focused laser beams. Invariant properties of light beams. Optical tweezers, scattering. Energy, momentum and angular momentum of electromagnetic and acoustic pulses. Quantum many-body theory; statistical mechanics of interfaces and dielectric functions.

My current focus is on reflection and transmission of waves of all kinds, in relation to work on my book (below).

Books

Theory of Reflection

Theory of Reflection: Reflection and Transmission of Electromagnetic, Particle and Acoustic Waves, Springer (2016, Second edition).


Nature news item

Like attracts like? Nature: international weekly journal of science (23 May 2012)

More information

View my publications.

View animations of particle wavepackets:

  • A0 Motion of the free-particle Gaussian wavepacket through its focal region.
  • B0 Motion of the free-particle Gaussian wavepacket through its focal region.
  • A1 Motion of the non-reflecting wavepacket Φ1(x,t)  through the potential region.
  • B1 Motion of the wavepacket Φ1(x,t) through the potential region.
  • C1 Comparison of the motion of the wavepackets Φ0(x,t) and Φ1(x,t).
  • A2 Total reflection of a wavepacket by the potential ħ / mx2.
  • A3 Partial reflection of a wavepacket by the delta function repulsive potential.
  • A4 Contraction and spreading of the Airy wavepacket in its zero-momentum frame.
  • B4 Space curve of the Airy wavepacket in its zero-momentum frame.
  • A5 Gaussian wavepacket in gravitational field.
  • A6 Schrödinger packet for a particle in a harmonic oscillator potential.
  • B6 Harmonic oscillator wavepacket: an animated space-curve.
  • C6 Packet based on first excited state of harmonic oscillator.
  • A7 Quantum bouncer on a spring.
  • A8 Airy wavepacket in gravitational field.